# Description

Android version of the "How Much Pizza to order?

http://www.nummolt.com/obbl/howmuchpizza/index.html

http://www.nummolt.com/obbl/howmuchpizza/index.html

"How much pizza...?" About adding fractions: Working with Improper fractions and Mixed fractions. The program build the problem, and you can solve filling the textboxes containing question marks. There's a tool that helps you find the common denominator.

Inspired by the works of Cynthia Lanius ("Who wants pizza?")

Nummolt - OBBL Math Toys

http://www.nummolt.com/obbl/index.html

MathTools reference:

http://mathforum.org/mathtools/tool/186520/

Math 3 Equivalent fractions

Math 4 Equivalent fractions, Simplifying fractions, Adding fractions, Fractions <--> decimals

Math 5, 6, 7 Equivalent fractions, Simplifying fractions, Adding fractions, Multiplying fractions, Writing decimals, Fractions <--> decimals

For more difficult exercises on fractions, we recommend:

Mathcats: "Old Egyptian Fractions":

http://play.google.com/store/apps/details?id=mathcats.oldegyptian.fractions

You must install this app before submitting a review.

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Write a review

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# Reviews

Helpfulness

Newest

Rating

Helpfulness

All Versions

All Versions

Latest Version

3.4

7 total

5 3

4 1

3 1

2 0

1 2

A Google User

Boring Boring

User reviews

Review deleted

# What's New

1.4.0 Version html in WebView

1.3 Fixed textbox

1.2 Multilingual app (en, ca, es, fr, it).

1.1 Lighter version

1.0 First version english.

# Additional information

Updated

February 2, 2015

Size

3.7M

Installs

1,000 - 5,000

Current Version

1.4.0

Requires Android

2.2 and up

Permissions

Report

Flag as inappropriate Offered By

nummolt

Developer

Visit website Email nummolt@gmail.com

Maurici Carbó
C/ Sant Antoni Maria Claret, 324
Barcelona 08041 S.PAIN

# Similar

## Dr. Panda's Restaurant

Come to Dr. Panda’s Restaurant and cook delicious food for the animal guests!

★ SmartAppsForKids – “Awesome and affordable app that preschoolers will love”

★ TheiMums – “This app is a great one for practicing fine motor skills, routines and sequencing as well as interacting with a variety of animals and taking their orders.”

★ FunEducationalApps – “TribePlay has proven to develop and create fun and top educational apps for preschoolers and toddlers”

★ BestAppsForKids – “A perfect example of when everything comes together perfectly – design, fun, interaction, great price, and within a kid-safe environment.”

In this app, kids will be introduced to cooking through fun and exciting mini-games. They will be exposed to a number of foods from different cultures, all from Dr. Panda’s cookbook which contains 10 different dishes and drinks; including pizza, apple pie, corn soup, Chinese stir-fry and fruit smoothies.

For kids, this game combines meal time with fun time, without any mess!

To prepare all of these delicious things, kids will complete varied activities such as slicing, frying, toasting, mixing and baking. Besides preparing and serving food, they will also have fun while feeding the animals, decorating the dining rooms, cleaning the tables, and recycling garbage.

KEY FEATURES

✓ 8 adorable animal guests to serve and feed

✓ Learn the basics of cooking with Dr. Panda’s 10 recipes

✓ Learn to help with the housework via 3 additional minigames

✓ Touch & Discover: Fantastic artwork, fun animations and sounds

✓ Kid-Friendly: Easy-to-use interface and no reading required

✓ Kids Safe: No third party advertisement or any in-app purchase

Privacy Policy

As a designer of kids’ games, we understand how important privacy is in this modern, digital world. You can read our privacy policy here: http://www.drpandagames.com/privacy

About Dr. Panda

Dr. Panda is a developer of games for kids. We develop games with educational values that help kids learn about the world. All of our games are safe and do not contain inappropriate content, in-app purchases or any third-party advertising.

If you’d like to know more about us and how we design games for kids visit our website www.drpandagames.com/about. If you have any questions feel free to send us an email at support@drpandagames.com or contact us on Facebook (www.facebook.com/drpandagames) or Twitter (www.twitter.com/drpandagames) or Instagram www.instagram.com/drpandagames.

## Fractions & Smart Pirates

Fractions for kids - fun and easy way to learn fractions with the Caribbean Pirates. Recognizing and Comparing Fractions, Equivalent fractions, Аdding fractions - If you're struggling with fraction problems Fractions & Smart Pirates is your answer.

On the first island the player learns to read fractions. In order to do so he/she offers the pirates some slices of pizza and try to guess what part of the pizza is left for other pirates to eat in the boat. If there is a mistake the pirates get in trouble.

On the second island, the pirates have to get across the bottomless abyss. In order to do it, they should balance the bridge using firecracker baskets. In this game the player assists the pirates in choosing a basket with an equivalent fraction.

On the third island the pirates come across an unexpected rival - one-eyed Captain. But our brave old sea dogs are not scared at all! With the player's help the pirates should get bigger watermelons than the Captain has.

On the fourth island, the pirates are tempted to treat themselves with a few pieces of a lovely cake. In this game, the player offer the pirate a piece of cake and guess what part of the whole cake his piece makes. If there is a mistake in calculation, the pirate's becomes sad and hungry, as the cake is eaten by a perky parrot.

Features:

* Four games in one: simple fractions, equivalents, comparison, and addition

* Simple fractions with denominators from 2 to 12 are randomly generated

* Fun animations of the pirate and his friends

* Training mode at the start of every level

* Three different levels of difficulty in each game: Easy, Medium, and Hard

## Maths Equations

DESCRIPTION

===========

Do you want to learn to solve systems of equations?

Do you want to know the full development step by step?

"Matemáticas Ecuaciones" is a simple and intuitive application for solving systems of linear equations of two equations with two unknowns by the following methods:

- Equalization

- Substitution

- Elimination

- Determinants (Cramer's Rule)

===========

Do you want to learn to solve systems of equations?

Do you want to know the full development step by step?

"Matemáticas Ecuaciones" is a simple and intuitive application for solving systems of linear equations of two equations with two unknowns by the following methods:

- Equalization

- Substitution

- Elimination

- Determinants (Cramer's Rule)

MAIN FUNCTIONALITIES

======================

- Multi language: English and spanish.

- Intuitive introduction of the system of ecuations in a preview pane before the resolution.

- Description step by step of the entire resolution process from the beginning to obtain the solution.

- Theoretical description of each of the methods.

- Graphical representation of the solution in a cartesian axes. You can see the exact point of intersection while you can slide the panel to move anywhere on the graph.

- The application is optimized for smartphones and tablets

POSSIBLE USES

==============

- Students in any grade level.

- Teachers, to introduce it into their teaching methods.

- Anyone with an interest in the wonderful world of mathematics.

NOTICE

======

- The methods of substitution, reduction and determinant are available with additional charge.

If you have any problems, before you put a negative comment, send an email to dev.android.mm@gmail.com and we will try to resolve it as soon as possible.

## Adding unit fractions

nummolt

1

The app proposes 21 challenges to overcome.

Obtaining the proper fractions listed at the top of the application, adding two or three unit fractions.

Obtaining the proper fractions listed at the top of the application, adding two or three unit fractions.

Each proposed proper fraction has a variable number of solutions.

And different levels of difficulty

You can not repeat unit fractions with the same value.

In the app you'll find a button to delete all the solutions found in the current problem, and to start from scratch.

The littlest unit fraction used in this app is 1/28.

The program is designed to show the usefulness of the subtraction of fractions in solving such problems.

From www.nummolt.com

This is an evolution of the "Old Egyptian Fractions" made in collaboration with www.mathcats.com

Hint:

In the Rhind Mathematical Papyrus (RMP) in 1650 BC the scribe Ahmes copied the now-lost test from the reign of the king Amenemamhat III .

The first part of the papyrus is taken up by the 2/n table. The fractions 2/n for odd n ranging from 3 to 101 are expressed as sums of unit fractions.

In this app you can build some of the Ahmes decompositions ( 2/3 , 2/5, 2/7, 2/9 ) and the discarded ones by him also.

The app allow to decompose also: 3/4 , 3/5 , 4/5 , 5/6 , 3/7 , 4/7 , 5/7 , 3/8 , 5/8 , 7/8 , 4/9 , 5/9 , 7/9 , 8/9 , 3/10 , 7/10 , 9/10.

You can use the knowledge acquired solving the 2/n decompositions to solve the rest of the problems.

More: http://nummolt.blogspot.com/2014/12/adding-unit-fractions.html

Math Tools reference of this app:

http://mathforum.org/mathtools/tool/260740/

Courses:

Math 1, 2 and 3: Fractions

Math 4: Writing fractions, Equivalent fractions, Comparing and ordering, Simplifying fractions, Adding fractions, Subtracting fractions

Math 5, 6 and 7: Writing fractions, Equivalent fractions, Comparing & ordering, Simplifying fractions, Adding fractions, Subtracting fractions, Multiplying fractions, Dividing fractions

## Maths Formulas Free

NSC Co.

1

Available in many languages, this is a perfect app on Google Play that provides all basic formulas in mathematics. It's very convenient for all students in high school or university and engineers to look for any easy or complicated formulas. It includes:

- Geometry

- Algebra

- Trigonometry

- Equations

- Analytic Geometry

- Differentiation

- Integration

- Matrix

- Probability and statistics

- Units Conversion.

- Math Tricks.

This app also has many tools to calculate the geometric shapes or find the roots of equations. Users can also share any formulas with friends by many ways: email, message, or Facebook.

Not only for smartphones, this app is also suitable for tablets with compatible interfaces.

- Geometry

- Algebra

- Trigonometry

- Equations

- Analytic Geometry

- Differentiation

- Integration

- Matrix

- Probability and statistics

- Units Conversion.

- Math Tricks.

This app also has many tools to calculate the geometric shapes or find the roots of equations. Users can also share any formulas with friends by many ways: email, message, or Facebook.

Not only for smartphones, this app is also suitable for tablets with compatible interfaces.

New features of the app:

- Multiple languages supported: English, French, Vietnamese, Chinese, Spanish, Japanese, German, Korean, Russian, Portuguese, Italian, Greek, Thai, Indonesian, Arabic, Hindi, Bengali, Malay, Turkish, Dutch, Polish, Romanian, Persian, Ukrainian, Azerbaijani, Swedish and Hungarian (28 languages totally). Users can change between English and other languages by setting in the language button. More languages to come soon.

- Favorite folder: users can save frequently used formulas into this folder.

- Search function: in each category, type on Search bar to quickly get a formula.

- Add new category "Units Conversion": conversion of all common units.

- Tools to convert measurement units, including: Weight, Length, Area, Volume, Speed, Time, Temperature, etc..

- Add your own formulas or notes in "Favorite" section.

- Add your own customised tools in "Tools" section.

Maths Formulas - a must-have app for your smartphones and tablets.

## DropPie

Fraction pieces are falling down.

Try to complete the circles.

Three full circles brings you to a higher level.

Move the pieces left and right with your finger.

If a piece is too big for all the circles, fling it in the bin.

If the sum of all the pieces in a circle is more than one, you can not use that circle anymore.

If this is the case for all the circles, the game is over.

You can speed up the falling by touching the circle beneath the pie.

There are 6 different starting levels.

Good luck and watch the dog!

Try to complete the circles.

Three full circles brings you to a higher level.

Move the pieces left and right with your finger.

If a piece is too big for all the circles, fling it in the bin.

If the sum of all the pieces in a circle is more than one, you can not use that circle anymore.

If this is the case for all the circles, the game is over.

You can speed up the falling by touching the circle beneath the pie.

There are 6 different starting levels.

Good luck and watch the dog!

## Ecuaciones Segundo Grado

martaro

1

Se ha comprobado en numerosos estudios que los alumnos aprenden más rápidamente matemáticas si tienen acceso a la solución de los problemas. Eso sí, primero el alumno ha de intentar resolver el ejercicio y llegar a un resultado con el que poder comprobar con la solución dada.

Las soluciones de una ecuación cuadrática son dadas por la fórmula cuadrática: x = (-b ± √(b^2 - 4ac)) / 2a o fórmula de Bhaskara.

La aplicación permite resolver ecuaciones de segundo grado mostrando la solución y el tipo que se trata.

INSTRUCCIONES:

Antes de usar la aplicación, escribe la ecuación cuadrática de la forma modelo, Ax² + Bx + C = 0 combinando los términos, moviendo todos los términos hacia el lado izquierdo de la ecuación y ordenándolos por grado descendiente.

Por ejemplo, escribe la ecuación 3x - 4 = -x² - 5x de la forma modelo combinando 3x y -5x para obtener 8x - 4 = x², moviendo el -x² hacia la izquierda y ordenando los términos para obtener x² + 8x - 4 = 0.

En dos sencillos pasos podrás obtener los resultados:

-Paso 1: Introduce los valores de las constantes a, b y c. Si la ecuación es incompleta pura (y=ax²+c=0)

o incompleta mixta (y=ax²+bx=0) , introduce 0 en el valor de la constante.

-Paso 2: Clica en Resolver.

Descarga gratis la aplicación y empieza a resolver las ecuaciones de segundo grado.

## MATES Selectividad

JW App

1

Mates Selectividad es una aplicación gratuita que contiene:

- Temario de Matemáticas I y Matematicas II de 2º Bachillerato y ejercicios resueltos para cada tema.

- Exámenes de Selectividad o Pruebas de Acceso a la Universidad ( PAU) de las distintas comunidades autónomas.

- Temario de Matemáticas I y Matematicas II de 2º Bachillerato y ejercicios resueltos para cada tema.

- Exámenes de Selectividad o Pruebas de Acceso a la Universidad ( PAU) de las distintas comunidades autónomas.

Con esta aplicación podrás consultar todos los temas de mates y podrás practicar haciendo ejercicios de matematicas por temas, para luego comprobar los resultados ya que los ejercicios están resueltos, y así aprobar tus examenes.

Si estas preparando la Selectividad (PAU), podrás consultar todos los exámenes resueltos distribuidos por comunidades autonomas.

Descarga Mates Selectividad y repasa matematicas de 2º de Bachiller de manera muy ordenada. Nosotros nos comprometemos a actualizarla regularmente para añadir nuevas funciones y ofrecerte nuevas herramientas para mejorar tu nota. No esperes más.

## Math Exercises 4 kids free

Exercises with review questions that help to study mathematics at school. Ideal to review exercises and math problems

This application will serve well to study, will serve as supporting teachers to teach students math refresher exercises

It is also ideal for reviewing exercises and doing homework during the summer holidays and Christmas without being a trivial application for children as it is very important to require some effort on your part

With this app children learn, reinforce and improve their knowledge of English, mathematics, knowledge of the environment and other subjects of 1st, 2nd, 3rd, 4th and 5th grade. Suitable for children aged 5, 6.7, 8 and 9 years who are studying first, second, third, fourth or fifth grade. Soon we will expand the questions to add more years of primary education (6th grade).

Valid for learning English because besides have questions in English and Spanish.

The questions are valid primary education for children in South America and Spain: Chile, Argentina, Mexico, Colombia, Venezuela, Bolivia, Ecuador and other Latin American as education levels from all countries are similar. They are also valid for children in England, United States (USA) and any country in which English is spoken

In addition, adults can use it as if it were a trivial or quiz questions to see if they know more than an elementary schooler. If you're an adult you should answer almost all questions correctly ... if you do not know is that no more than an elementary schooler.

In the field of mathematical addition, subtraction, multiplication and division wonder. It also has a section of mathematical problems

What do you know primary? Are You Smarter than a child in elementary school?

The number of questions and answers is quite high and soon will be adding more questions and more elementary courses. A

If you have problems in use, please send us an email and we will try to fix it ASAP.

This educational app for children is valid for any tablet or mobile both HD as normal. To play you do not need internet connection or wifi since educational questions are included in the terminal and not loaded from internet.

## PRO Statistics

"We appreciate each of the ratings and reviews that give us" - Creatrixzone Inc.

Stop by our website: http://creatrixzone.com

Read our publication about this app we do and which we are proud of their comments: http://creatrixzone.com/blogitem?id=5&c=1

Participate and comments that we can add or improve for this application, remember that your opinion is important for future updates.

Statistics Pro is an application focused area of statistics that deals infer results on a population from one or more samples entered by the user.

Can benefit from total sampling, in addition to the mathematical proof of the mean, median, Fashion, Hope, Variance and Standard Deviation.

PRO version also features a new module probability.

As the module is based on a probability number, between 0 and 1 indicating the possibilities verified when a random experiment.

And containing the following formulas of probability:

- Combinations

- Permutations

- Binomial Distribution

- Poisson Distribution

- Multinomial Distribution

- Geometric Distribution

- Normal Distribution or Z.

Which gives you the necessary help to solve the above issues just by entering the data of the problem or situation that comes your way.

## Exercises primary school kids

Exercises with review questions that help elementary school studying. Ideal exercises to review math, language, and knowledge of the English

This application will serve well to study, will serve as support for teachers to teach students review exercises of various subjects.

It is also ideal for reviewing school exercises and doing homework during the summer holidays and Christmas

With this app children learn, reinforce and improve their English language skills, mathematics, knowledge of the environment and other subjects in 1st, 2nd, 3rd, 4th and 5th grade. Valid for children ages 5, 6,7, 8 and 9 who are studying first, second, third and fourth grade. Soon we will expand to add more questions Primary education courses 4th, 5th and 6th grade.

Valid for learning Spanish and English and having questions in English and Spanish.

The questions are valid for primary school children in South America and Spain: Chile, Argentina, Mexico, Colombia, Venezuela, Bolivia, Ecuador and other Latin American as education levels from all countries are similar. They are also valid for children in England, United States (USA) and any country where English is spoken

In addition, adults can use it as if it were a trivial or quiz questions to see if they know more than a primary school kid. If you're an adult you should answer almost all questions correctly ... if you do not know is that no more than a primary school kid.

In the area of math addition, subtraction, multiplication and division will wonder.

In language synonyms, antonyms, verbs, reading comprehension, etc. wonder Some of the questions are designed to promote reading comprehension of children to learn to read and understand what they have read. You will be asked for vowels, consonants, so that children develop reading comprehension and learn to read and write properly.

Do you want your primary? You know that a child's primary?

The number of questions and answers is quite high and soon will be adding more questions and more elementary courses. A

If you have problems in using, send us an email and we will try to fix ASAP.

This educational application for children is valid for any tablet or mobile both HD as normal. To play it is not necessary to have internet or wifi since educational questions are included in the terminal and not loaded from internet.eduardodiazruiz

carola

caro

minahonda

## Integral calculator

Full version. This app is 100%Free!

Users college level with some knowledge in integral and/or Fourier series will appreciate in depth all features of this app.

Integrals calculator is a powerful app to calculate indefinite and definite integrals and make a complete functions analysis of real variable.

Integrals Calculator makes operations with functions such as Derivate, Integral and Fourier Series coefficients numerical calculations.

Also, Integrals calculator solve analytically differential ordinary equations up to order two (or output false when solution were not found), calculates Taylor polynomial around a point.

This app help in one variable real calculus, from Integrals, to Taylor polynomial. Also it calculates derivate, plot functions, Taylor Polynomial, derivate and so on ...

In resume, with Functions Integrator is able to do the following operations:

- Plot f(x) functions euclidean R2 space.

- Calculate indefinite integral or primitive or says if f is not integrable.

- Analytic Solver ODE with up to order 2.

- Numerical calculation of Fourier Series An, Bn Coefficients.

- Definite integral calculations.

- Locale extreme calculations.

- Limit of a function in a point.

- Taylor Polynomial Calculations.

- Semi-infinite and infinite definite integral calculations.

- Calculate derivate.

Integrals calculator requires internet connection!!

Reject imitations! This is the only integral calculator certified from www.mathstools.com.

## Frosby Learning Games Free

A collection of 8 free mini-games from our best-selling apps Frosby Learning Games 1 & 2 - giving a sample of our fun and educational variety games for preschool children (aged 2-5).

These apps contain no ads or in-app purchase, and a parental lock ensures your child can sample the games without any worries.

Here is a summary of some of the great game features of the full versions:

Frosby Learning Games 1

- Fun counting games from 1-10

- Learn body parts in fun dress-up games

- Learn Size: smallest to biggest

- Learn colours, 'rubout the screen' games and many more!

Frosby Learning Games 2

- Learn shapes with physics enhanced gameplay

- Build a car and drive it to dinosaur land!

- Learn opposites and spot the difference

- Give eggs hairstyles, make a pizza, lay the table and much more!

--------------------

YOUR PRIVACY

Frosby takes your children’s privacy very seriously. Frosby Learning Games Free:

- Does not collect information

- Does not contain ads

- Does not contain in-app purchases

- Does not use analytics / data collecting tools

Frosby is a member of ‘Moms with Apps,’ a collaborative group of family-friendly developers seeking to promote quality apps for kids and families.

# More from developer

## Time Calculator

nummolt

1

Time Elapsed / Time Countdown Time Calculator

With the Time Calculator you can calculate the subtraction between 2 dates:

You can fix a date in the past and subtract it from the present time: You get the elapsed time.

You can fix a date in the future and subtract the present time: You get the countdown to the fixed date.

(Light gray dates are in the past; Light green dates are in the future)

Don't work for dates earlier than 1582.

(Because the Gregorian Calendar)

Android version of:

http://www.mathcats.com/explore/elapsedtime.html

and:

http://www.nummolt.com/obbl/time/calculator.html

A work in collaboration www.mathcats.com and www.nummolt.com

(Wendy Petti and Maurici Carbó)

Practical applications proposed by users:

-. Useful to calculate demurrage. (http://en.wikipedia.org/wiki/Demurrage)

-. To calculate amount of pills of a medical treatment.

-. Calculate the number of days, or hours, or minutes, or seconds, remaining until retirement.

-. How old am I?

-. How old are you?

-. How many months, or weeks, or days, or hours, or minutes, or seconds are there in 1000 years?

-. Estimate the number of heartbeats throughout life at this time.

- multiplying lived minutes by a number between 60 and 100 for human beings.

- minutes, multiplied by 500 in the case of mice.

- minutes, multiplied by 28 in the case of elephants.

- minutes, multiplied by 6 in the case of the giant Galapagos tortoise.

-. Estimate the number of breaths made throughout life at this time: (for human beings)

- birth to 6 weeks: 30–60 breaths per minute

- 6 months: 25–40 breaths per minute

- 3 years: 20–30 breaths per minute

- 6 years: 18–25 breaths per minute

- 10 years: 15–20 breaths per minute

- adults: 12–20 breaths per minute

## Touch Pythagoras

nummolt

1

The Pythagorean Theorem Interactive: a^2 + b^2 = c^2

App :

change the lengths of the legs (dragging).

change the length of the hypotenuse with two fingers.

zoom (pinch zoom) and rotate the figure (dragging).

There are 6 ways to view the Pythagorean theorem.

- Unit surfaces.

- Two equivalent square containing the same surface.

- The square for each leg in the square of the hypotenuse (Euclid)

- Pingi - Dudeney proof.

- Da Vinci.

- Bhaskara reasoning.

Change the precision of the lengths. (In the contextual menu)

This application is also a small laboratory to investigate about the Pythagorean Theorem:

For example, you can experiment easily, looking for the exact solutions of the Pythagorean Theorem:

3² + 4² = 5² is not the only exact solution:

Below 21, there are 3 primitive triples:

3² + 4² = 5²

5² + 12² = 13²

6² + 8² = 10² (Not a true primitive result: Multiple of 3,4,5)

8² + 15² = 17²

9² + 12² = 15² (Not a true primitive result: Multiple of 3,4,5)

12² + 16² = 20² (Not a true primitive result: Multiple of 3,4,5)

Likewise it is also possible to find the solutions below 31 (11 solutions in all: but only 5 primitives)

Or solutions below 101 (52 solutions in all: but only 16 primitives)

More about this: Pythagorean triples: http://en.wikipedia.org/wiki/Pythagorean_triples

Touch Math Apps:

http://www.nummolt.com

MathTools reference of this app:

Math 4 Triangles

Math 6 All previous and: Geometry in the plane, Pythagorean theorem

Math 7 All previous and: Quadrilateral properties

Geometry All previous Right Triangles, Pythagorean theorem, Trigonometry

Algebra Exponents

Algebra II General

Trigonometry

## Circadian clock

nummolt

1

The mechanism :

The green outer ring with 5 primary partitions and and 300 smaller partitions gives 59/300 turns per minute counterclockwise: 11.8 turns per hour.

The planetary gear of the seconds, in green color, is driven by the outer ring and gives 59 rph counterclockwise. And in turn, the axis makes a complete turn clockwise, rolling on the inside of the crown of the minutes, by hour.

The hand of the minutes, in blue color, turning on the central axis and linked to the axis of the planetary gear of the seconds, makes a complete turn every hour.

The wheel that rotates clockwise integrally with its base and with the hand of the minutes, make to spin counterclockwise two blue planetary wheels. These two planetary wheels spins counterclockwise a third planetary gear.

The third planetary wheel rotates one turn per hour clockwise and transmits the rotation to the fourth planetary wheel. The fourth planetary wheel spins counterclockwise and progresses clockwise.

The fourth blue planetary wheel gives 2 turns on itself and its axis gives the entire turn around the sphere of the clock every 12 hours.

On the four planetary wheels is mounted the hour hand: a big red triangle, giving rigidity to the structure and indicating the hours and rotating clockwise.

The big red triangle, linked to a freewheel on the central axis, drives the rotation of the three static planetary yellow wheels of the day. Turning counterclockwise about its fixed axis, rotates counterclockwise the yellow big crown that distinguishes the day light hours, of the darkness of the night and makes a complete turn every 24 hours.

The big red triangle, also linked to another freewheel on the central axis, drives the rotation of three static planetary wheels magenta of the week, much bigger than those for the day. Turning counterclockwise about its fixed axis, and spinning counterclockwise the crown magenta indicating the day of the week, and makes a complete turn every week.

Interaction:

Buttons:

The buttons are used to toggle the different layers of the watch:

-. Blue hand of minutes, and the green planetary gear of the seconds

-. Green crown of the seconds.

-. Static blue sphere of the hours and the minutes.

-. Planetary gear set and red triangle of the hours.

-. Planetary gear set in yellow color, and yellow crown of the day and the night

-. Planetary gear set in magenta color, and yellow crown of weekday.

-. Clock base body.

Dragging:

-. Dragging a finger, you can move the clock from its initial position.

-. Joining or separating and sliding two fingers on the screen, reduce or increase the size of the watch.

-. Dragging and rotating about the central axis with the finger on the red triangle of the hours, you can change the time. After removing the finger, the 'circadian clock', will slowly readjusting to redial the actual system time.

Circadian Clock:

www.nummolt.com

Technical drawings for the Circadian Clock:

http://www.nummolt.com/CircadianClock/

© 2014 Maurici Carbó, architect.

http://nummolt.blogspot.com/2014/03/posted-new-circadian-clock-at-google.html

Notes from developer:

The term 'circadian' comes from the Latin 'circa', meaning "around" (or "approximately"), and 'diem' or 'dies', meaning "day".

This app is only a clock, with many layers, showing many overlapped mechanisms, with zoom. The triangle of the hours is manually adjustable, and has an algorithm to reset the clock to the system time after any adjustment.

Nothing concerning the biological circadian cycle.

But one of the layers of the clock represents daylight.

There's a version in live wallpaper format.

Is a paid version:

At: https://play.google.com/store/apps/details?id=com.nummolt.circadian.clock.wallpaper

## Touch decimals Place value ±

nummolt

1

Touch decimal:

Double interactive place value chart, with up to 40 decimal columns.

Mathematical analogy with positive and negative tokens.

Wireless abacus.

Designed to:

- Show and experience the addition and addition with carry.

- Show and experience the subtraction and subtraction with borrowing.

- Zero as "nothing" in a place value place, or as an undetermined number of negative-positive pairs of particles with sign.

MAIN ELEMENTS:

Two charts.

Each chart with a variable number of places.

In the places, a variable number of tokens with positive or negative value

TOKENS:

The life of tokens:

A token can be positive or negative.

A positive token is born with the tap of a finger on the screen

A pair of positive-negative tokens is born with a tap of two fingers on the screen

A token disappears if it crosses the top or bottom border.

The behavior of tokens:

Positive and negative tokens have the same behavior:

A token can cross at will the intermediate horizontal border

When a token crosses the border on the right, it becomes 10 tokens.

A token need 9 companions from the old place to cross the border to the left.

Positive and negative tokens may be in the same place.

But if two tokens of different signs meet, they cancel each other.

PLACES:

A place is a rectangle.

A place can contain tokens of the same or different sign.

A rectangle has 4 borders.

The upper and the lower borders can be the external border or the intermediate border.

Tokens can cross freely the intermediate border.

If a token cross the external border, disappears.

To get the permission to cross left borders, a token needs 9 companions of the same sign.

A token recovers 9 companions if cross the right borders.

GENERAL:

Chart:

A chart is the horizontal row of places.

There are two charts: The upper chart and the lower chart.

There is a button in each chart to change the sign of all its tokens.

Control:

In the 'settings' option, there is an option to erase all tokens of each chart, or to erase all tokens and refresh all to start again from scratch.

* * * * * * *

Touch decimals Place value ±

The behavior of places and tokens of this app describes the behavior of the numbers in the decimal system.

Courses:

Math 1, 2, 3, 4 Number sense: Place value.

Math 5, 6, 7 Number sense: Base Ten:

*** COMMON CORE State standards initiative:

**Grade 1:

Understand place value:

CCSS.MATH.CONTENT.1.NBT.B.2

Use place value understanding and properties of operations to add and subtract: CCSS.MATH.CONTENT.1.NBT.C.4; CCSS.MATH.CONTENT.1.NBT.C.5; CCSS.MATH.CONTENT.1.NBT.C.6

** Grade 2:

Understand place value:

CCSS.MATH.CONTENT.2.NBT.A.1

Use place value understanding and properties of operations to add and subtract:

CCSS.MATH.CONTENT.2.NBT.B.5; CCSS.MATH.CONTENT.2.NBT.B.6; CCSS.MATH.CONTENT.2.NBT.B.7; CCSS.MATH.CONTENT.2.NBT.B.9

** Grade 3:

Use place value understanding and properties of operations to perform multi-digit arithmetic.

CCSS.MATH.CONTENT.3.NBT.A.2; CCSS.MATH.CONTENT.3.NBT.A.3

** Grade 4:

CCSS.MATH.CONTENT.4.NBT.B.4;

Developed by: http://www.nummolt.com

## Adding apples and oranges

nummolt

1

Educational app about adding apples and oranges.

To calculate the value of an apple and an orange from 2 purchases.

(Assuming that all apples are equal and that all oranges are equal)

About mental arithmetic with a pre-algebra tool, introducing the Gaussian elimination. ( Gauss - Jordan )

From http://www.nummolt.com/obbl/appleorange/index.html

nummolt - Obbl - Math Toys collection - Mathcats.

To calculate the value of an apple and an orange from 2 purchases.

(Assuming that all apples are equal and that all oranges are equal)

About mental arithmetic with a pre-algebra tool, introducing the Gaussian elimination. ( Gauss - Jordan )

From http://www.nummolt.com/obbl/appleorange/index.html

nummolt - Obbl - Math Toys collection - Mathcats.

MathTools reference:

http://mathforum.org/mathtools/tool/178345/

Algebra Linear Systems

Algebra II Solving systems of equations, Elimination

PreCalculus Solving systems of linear equations, Gauss-Jordan Method, determinants

We recommend the paid 'Apples and Oranges 1 Decimal':

http://play.google.com/store/apps/details?id=com.appleorange.firstdecimal

(http://mathforum.org/mathtools/tool/219536/)

Math 7: Linear relationships, Find slope, Slope-intercept form, Equation of the line, Rect coordinate geometry, First quadrant, Geometry in the plane

Algebra: Linear Equations, Slope Between Points, Finding Intercepts, Slope - Intercept Form, Point - Slope Form, Graphing, Parallel Lines, Perpendicular Lines, Linear Formulas, Analyzing Linear Data, Is It Linear?, Writing an Equation, Line of Best Fit, Linear Systems, Solve by graphing, Solve by substitution, Solve by combination, Inconsistent System, Applications

Algebra II: Solving systems of equations, Cramer's rule, Matrices, Elimination, Substitution

NOTE:

'Adding apples and oranges' app free, is a simplified version of the first part of the nummolt's paid app: 'Apples and oranges 1 decimal place'. (the Gauss-Jordan elimination)

All options "Apples and oranges first decimal":

( 1: Gauss-Jordan elimination; 2: Graphic; 3: Substitution; 4: Cramer's rule; 5: Inverse matrix )

Credits:

Feature graphic by: http://photo-lgz.blogspot.com/

## Touch Fraction

nummolt

1

Interactive fraction.

About fractions, and the construction of the rational numbers: ℚ set.

To play with proper and improper fractions, positive and negative also.

About fractions, and the construction of the rational numbers: ℚ set.

To play with proper and improper fractions, positive and negative also.

All fractions in order from least to greatest. You can increase or decrease the fractions included in the app, increasing or decreasing the density of lines in the lower graph framework. The accuracy of the application depends on the capabilities of the device.

The application provides two representations: a circle and a straight line whose has the slope of chosen fraction

Spin the fraction: You can choose different fractions in order from low to high within the possibilities included in the grid at the bottom formed by pairs of integers.

Select equivalent fractions with the rational representation diagram (the lower grid).

Change range of fractions affordable with a "pinch zoom" on the lower grid.

In the vertical strip of the grid graph goes from 0 to 1 you can see the number of units containing the selected improper fraction: Each unit is a black square.

The program is useful to learn about fractions, coordinate geometry, rational numbers, cartesian plane, slope, and the equivalent classes of pairs of integers.

Nummolt construction toys:

http://www.nummolt.com

MathTools reference:

Math 1, 2, 3, 4, 5 Fractions

Math 6 All previous and Rect coordinate geometry

Math 7 All previous and Rational numbers, Linear relationships, Ratio and proportion

Geometry Points and lines, Cartesian plane, Slope

Algebra Whole, Rational

## Circadian clock live wallpaper

nummolt

1

Version of the free nummolt's Circadian Clock, as a Live Wallpaper.

This time, the buttons of the original app, are in the preferences checkboxes of the installer.

This time, the buttons of the original app, are in the preferences checkboxes of the installer.

What is the Circadian Clock?

Here: http://nummolt.blogspot.com.es/2014/03/posted-new-circadian-clock-at-google.html

Buy this app to support the development work of educational software that makes nummolt.com

## Reading fractions

nummolt

1

Read fractions - Reading fractions

Basic tool for to experiment with fractions:

The app lets you view the fractions represented in the form of overlapping circles and bars.

The two graphs are interactive. They can be changed by dragging on the screen.

Graphically, fractions are always shown in simplified form.

There are two spinners to select fractions: one for the numerator and one for the denominator.

At the right there are two lock buttons:

The top button locks the numerator when the graph is modified.

The lower button locks the denominator when the graph is modified.

When both buttons are unlocked, the fractions are formed from the denominator 360 (the maximum allowed in the program) when the graph is modified.

When the two buttons are locked, the program always remains under the same fraction, but expresses its equivalent fractions in the spinners.

When the fraction expressed in the spinners is not in its simplified form, can be simplified by clicking on the simplified expression on his left.

Basic tool for to experiment with fractions:

The app lets you view the fractions represented in the form of overlapping circles and bars.

The two graphs are interactive. They can be changed by dragging on the screen.

Graphically, fractions are always shown in simplified form.

There are two spinners to select fractions: one for the numerator and one for the denominator.

At the right there are two lock buttons:

The top button locks the numerator when the graph is modified.

The lower button locks the denominator when the graph is modified.

When both buttons are unlocked, the fractions are formed from the denominator 360 (the maximum allowed in the program) when the graph is modified.

When the two buttons are locked, the program always remains under the same fraction, but expresses its equivalent fractions in the spinners.

When the fraction expressed in the spinners is not in its simplified form, can be simplified by clicking on the simplified expression on his left.

Additionally fractions are shown in written words, mixed fractions (if needed) as a percentage and as a decimal number with dot.

Fractions in words: Available in English, Catalan, Castilian (spanish), and French.

From www.nummolt.com

## Adding unit fractions +

nummolt

1

The app proposes 31 challenges to overcome.

Build the proper fractions listed at the top of the application, adding two, three or four unit fractions.

Build the proper fractions listed at the top of the application, adding two, three or four unit fractions.

Each proposed proper faction has a variable number of solutions.

And different levels of difficulty

You can not repeat unit fractions with the same value.

In the app you'll find a button to delete all the solutions found in the current problem, and to start from scratch.

The littlest unit fraction used in this app is 1/66.

The program is designed to show the usefulness of the subtraction of fractions in solving such problems.

From www.nummolt.com

This is an evolution of the "Old Egyptian Fractions" made in collaboration with www.mathcats.com

Hint:

In the Rhind Mathematical Papyrus (RMP) in 1650 BC the scribe Ahmes copied the now-lost test from the reign of the king Amenemamhat III .

The first part of the papyrus is taken up by the 2/n table. The fractions 2/n for odd n ranging from 3 to 101 are expressed as sums of unit fractions.

In this app you can build some of the Ahmes decompositions ( 2/3 , 2/5, 2/7, 2/9, 2/11 ) and the discarded ones by him also.

The app allow to decompose also: 3/4 , 3/5 , 4/5 , 5/6 , 3/7 , 4/7 , 5/7 , 6/7 , 3/8 , 5/8 , 7/8 , 4/9 , 5/9 , 7/9 , 8/9 , 3/10 , 7/10 , 9/10, 3/11, 4/11, 5/11, 6/11, 7/11, 8/11, 9/11, and 10/11.

You can use the knowledge acquired solving the 2/n decompositions to solve the rest of the problems.

The app warns of obtaining the best solution (the one with the lowest denominators)

If it's one of the problems appearing in the Rhind Mathematical Papyrus table, the app warns of coincidence with the solution written in the Rhind 2/n table.

More: http://nummolt.blogspot.com/2014/12/adding-unit-fractions.html

## Adding unit fractions

nummolt

1

The app proposes 21 challenges to overcome.

Obtaining the proper fractions listed at the top of the application, adding two or three unit fractions.

Obtaining the proper fractions listed at the top of the application, adding two or three unit fractions.

Each proposed proper fraction has a variable number of solutions.

And different levels of difficulty

You can not repeat unit fractions with the same value.

In the app you'll find a button to delete all the solutions found in the current problem, and to start from scratch.

The littlest unit fraction used in this app is 1/28.

The program is designed to show the usefulness of the subtraction of fractions in solving such problems.

From www.nummolt.com

This is an evolution of the "Old Egyptian Fractions" made in collaboration with www.mathcats.com

Hint:

In the Rhind Mathematical Papyrus (RMP) in 1650 BC the scribe Ahmes copied the now-lost test from the reign of the king Amenemamhat III .

The first part of the papyrus is taken up by the 2/n table. The fractions 2/n for odd n ranging from 3 to 101 are expressed as sums of unit fractions.

In this app you can build some of the Ahmes decompositions ( 2/3 , 2/5, 2/7, 2/9 ) and the discarded ones by him also.

The app allow to decompose also: 3/4 , 3/5 , 4/5 , 5/6 , 3/7 , 4/7 , 5/7 , 3/8 , 5/8 , 7/8 , 4/9 , 5/9 , 7/9 , 8/9 , 3/10 , 7/10 , 9/10.

You can use the knowledge acquired solving the 2/n decompositions to solve the rest of the problems.

More: http://nummolt.blogspot.com/2014/12/adding-unit-fractions.html

Math Tools reference of this app:

http://mathforum.org/mathtools/tool/260740/

Courses:

Math 1, 2 and 3: Fractions

Math 4: Writing fractions, Equivalent fractions, Comparing and ordering, Simplifying fractions, Adding fractions, Subtracting fractions

Math 5, 6 and 7: Writing fractions, Equivalent fractions, Comparing & ordering, Simplifying fractions, Adding fractions, Subtracting fractions, Multiplying fractions, Dividing fractions

## Jujol arq.

nummolt

1

Review and locate the Josep Maria Jujol main architectural works:

Casa Bofarull Els Pallaresos.

Església del Sagrat Cor de Vistabella

Teatre del Patronat Obrer de Tarragona

Casa Ximenis de Tarragona

Can Negre de Sant Joan Despí

Casa Sansalvador de Barcelona

Casa Planells de Barcelona

......

He worked with Antoni Gaudí on many of his most famous works: Casa Batlló (facade cladding), Casa Milà (balcony railings and ceiling), Park Güell (Roofing and continuous bench)

Casa Bofarull Els Pallaresos.

Església del Sagrat Cor de Vistabella

Teatre del Patronat Obrer de Tarragona

Casa Ximenis de Tarragona

Can Negre de Sant Joan Despí

Casa Sansalvador de Barcelona

Casa Planells de Barcelona

......

He worked with Antoni Gaudí on many of his most famous works: Casa Batlló (facade cladding), Casa Milà (balcony railings and ceiling), Park Güell (Roofing and continuous bench)

## Touch Natural Numbers

nummolt

1

Small laboratory of Natural Numbers:

The Prime numbers are the building blocks of the numbers.

With this app you can:

Analyze the factors of a Composite number.

( Prime factorization of all the composite numbers between 1 and 28181 ).

Build a Composite number from its factors. (multiplication and division of Natural Numbers)

Localize or select a number in the Ulam Spiral.

(Only the Prime Numbers have a color in this spiral).

Verify all the possible products between Primes in a composite number with the Parabolic Sieve (Yuri Matiyasevich & Boris Stechkin).

Analyze or build a number with the Place Value activity (Addition and Subtraction of Natural Numbers)

Understand the Modulo of a number.

Know about the polygonal numbers and the numbers as the sum of two prime numbers, and as the sum of three Prime Numbers.

The Prime numbers are the building blocks of the numbers.

With this app you can:

Analyze the factors of a Composite number.

( Prime factorization of all the composite numbers between 1 and 28181 ).

Build a Composite number from its factors. (multiplication and division of Natural Numbers)

Localize or select a number in the Ulam Spiral.

(Only the Prime Numbers have a color in this spiral).

Verify all the possible products between Primes in a composite number with the Parabolic Sieve (Yuri Matiyasevich & Boris Stechkin).

Analyze or build a number with the Place Value activity (Addition and Subtraction of Natural Numbers)

Understand the Modulo of a number.

Know about the polygonal numbers and the numbers as the sum of two prime numbers, and as the sum of three Prime Numbers.

What is all this about? Read the nummolt blog post:

http://nummolt.blogspot.com.es/2014/06/touch-natural-numbers.html

Touch Math Apps:

http://www.nummolt.com

Registered at MathTools ( MathForum )

http://mathforum.org/mathtools/tool/240793/

Courses:

* Math 1 - Place value

* Math 2 - Place value

* Math 3 - Addition, Subtraction, Multiplication, Division, Whole numbers, Place value, Prime, Composite, Factor, Prime factorization, Divisibility tests, Multiple

* Math 4 - Addition, Subtraction, Multiplication, Division, Whole numbers, Place value, Prime, Composite, Factor, Prime factorization, Divisibility tests, Multiple

* Math 5 - Addition, Subtraction, Multiplication, Division, Whole numbers, Properties of numbers, Prime, Composite, Factor, Prime factorization, Divisibility tests, Multiple

* Math 6 - Addition, Subtraction, Multiplication, Division, Properties of numbers, Exponents, Prime, Composite, Factor, Prime factorization, Divisibility tests, Multiple

* Math 7 - Properties of numbers, Roots/radicals, Writing square roots, Prime, Composite, Factor, Prime factorization, Multiple

## Apples and oranges 1 decimal

nummolt

1

Apples & Oranges - Algebra

Adding Apples and Oranges Version with 1 decimal

Adding Apples and Oranges Version with 1 decimal

This new application is a basic tool to learn algebra.

Trying solving a system of linear equations with two equations and two unknown variables. (Two purchases)

Based on the same problem seen at the free "Adding Apples and Oranges." (https://play.google.com/store/apps/details?id=com.appleorange.addingapplesandoranges) where only used integers.

Now, this new program works externally with a decimal.

It contains:

. A button that generates new questions ("two new purchases of fruits").

. Two drop-downs to select a solution and a button to verify: The verification button checks the solution, and adds it to the list of the session.

You can edit the statements. The program checks if the determinant of the proposed statement is nonzero.

. The 5 tools to help resolve the problem:

* Tool 1: Gauss-Jordan elimination:

The two equations are represented as two purchases of fruits.

Contains tools to add one column to another, multiply, divide and change the sign for to get to have one apple on a side and and an orange at the other.

The result of the two additions are the values of apple and orange.

* Tool 2: Graphic:

Contains a graphic frame and 2 drop-downs to find the solution, using the method essay / error.

The problem posed is a linear system of equations, so the results must be ever into two lines that intersect.

To get the answer, one should find this point.

You can also click directly on the chart.

The graph is divided by the diagonal.

Below the diagonal, apple values are entered, for to get the values of the orange.

Above the diagonal, one enters the price of the orange.

The meeting point of the two lines is represented by a yellow dot.

* Tool 3: Two weighing scales:

Shows two weighing balances. On the left, due to its drop-down, which determines the value proposed for apples: results gives the price of oranges in terms of the two equations.

The right hand scale gives the results from the proposed price for oranges.

When a scale is balanced, gives the results of both the price of the apples and oranges.

* Tool 4: Cramer's rule:

This tool solves the problem at once.

Contrary to what happens in other tools, here we have to manually enter the data of the problem. The two equations (two purchases) are represented in horizontal rows.

If you have not entered data, the tool warns that you can not solve the problem.

It can also warn when the determinant is zero:

The determinant is zero when the two lines that we saw in the graphical tool, are not crossing. This happens when they are parallel. And the lines are parallel when a purchase (equation) is linear function of the other. (eg 1 A + 2 O= n1 and 2 A + 4 O = n2)

The program automatically never generates such problems.

* Tool 5: Inverse matrix:

The tool represents the terms of the equation automatically and in landscape format (each purchase is a row)

The resolution tool there are the terms of the two equations on the left and the identity matrix at right.

The objective is to calculate the inverse matrix.

This is achieved by operating the rows, until the data from the equations (on the left) become the identity matrix.

At this time to the right we have the inverse matrix.

The multiplication of the results vector by the inverse matrix gives the solution.

This program shows rounded numbers.

Internally works with all decimals needed.

If you try to do these calculations with a calculator, you'll see that this program displays the friendly face of algebra.

Mathforum MathTools Reference:

http://mathforum.org/mathtools/tool/219536/

Math 7: Linear relationships, Find slope, Slope-intercept form, Equation of the line, Rect coordinate geometry, First quadrant, Geometry in the plane

Algebra II: Solving systems of equations, Cramer's rule, Matrices, Elimination, Substitution

Buying this program will help develop new nummolt apps.

Credits:

Feature graphic by: http://photo-lgz.blogspot.com/

## ninedigits workshop

nummolt

1

The game is about to find solutions ordering the digits from 1 to 9 in a square of 3 * 3 where the sum of the numbers of the two top rows is equal to the bottom row.

This program is aimed at reflecting on the addition. The goal is to find results that meet the primary condition. We must be aware that after obtaining a correct result can be achieved more easily results having in mind the properties of the sum.

Interaction:

To swap two digits must be done tap on each digit, then the digits change the color, and the exchange occurs.

From:

http://www.nummolt.com/obbl/ninedigits/ninedigitsbasic.html

nummolt - Obbl - Math Toys collection - Mathcats.

Ninedigits has 336 solutions. If the program would be easy for someone, then the goal could be to find valid solutions in which a lady could travel chess boxes 1 to 9 making right moves to this tab. According to our analysis, there are 3 solutions of this type. You can also look under the same condition, but with the tower of chess. This combination of conditions has only one solution. The program clearly shows the production of these special results.

As a safety mechanism, the delete button only works when the program displays a correct solution of the problem.

Registered in Math Tools (MathForum):

http://mathforum.org/mathtools/tool/234619/

Classified for courses:

Math 2 Addition

Math 3 Addition, Mental math

Math 4 Addition, Mental math

Math 5 Addition, Mental math, Commutative

Math 6 Addition, Mental math, Commutative

Math 7 Mental math, Commutative

Aligned with Common Core Math:

Grade 3 and up:

Grade 3 » Number & Operations in Base Ten

CCSS.Math.Content.3.NBT.A.2

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

Origin of the game:

The ninedigits is based on an idea described in the book: "New Mathematical Diversions" by Martin Gardner published in 1966.