Touch Fraction

nummolt

- April 14, 2014

1

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Description

Touch Fraction:

Interactive fraction.

About fractions, and the construction of the rational numbers.

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

The application lets you play with fractions: 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 understand: 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:

http://mathforum.org/mathtools/tool/200416/

Math 1 Fractions

Math 2 Fractions

Math 3 Fractions

Math 4 Fractions

Math 5 Fractions

Math 6 Fractions, Rect coordinate geometry

Math 7 Rational numbers, Fractions, Linear relationships, Ratio and proportion, Rect coordinate geometry

Geometry Points and lines, Cartesian plane, Slope

Algebra Whole, Rational

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Helpfulness

All Versions

All Versions

Latest Version

3.0

8 total

5 3

4 0

3 1

2 2

1 2

User reviews

nummolt November 12, 2013

Spin the fraction: You can choose different fractions in order from low to high within the possibilities included in the grid below formed by pairs of integers.
Select equivalent fractions with the rational representation diagram (the lower matrix of lines).
Change range of fractions affordable with a "pinch zoom" on the lower grid.
Thanks! What's New

v1.3 optimized for 10 in. tablets

v1.2 minor improvements.

v1.1 interaction improved.

v1.0 first version

Additional information

Updated

April 14, 2014

Size

264k

Installs

1,000 - 5,000

Current Version

1.3

Requires Android

2.2 and up

Content Rating

Everyone

Contact Developer

# Similar

## Fractions Math

GK Apps

1

Listen Read Device Only Added Installed This free math app is a fractions calculator with various functions:

- add, subtract, multiply and divide fractions.

- convert fractions in decimals,

- simplify fractions

- compare fractions

- find the lowest common denominator

- fraction trainer, to learn fraction calculations

Best mathematical tool for school and college! If you are a student, it will helps you to learn arithmetics and calculations with fraction numbers.

Note: A common fraction consists of an integer numerator, displayed above a line (or before a slash in this app), and a non-zero integer denominator, displayed below (or after the slash) that line. Numerators and denominators are also used in fractions that are not common, including compound fractions, complex fractions, and mixed numerals.

1

Listen Read Device Only Added Installed ## Fraction for 1st grade(Free)

Vpoint

1

Listen Read Device Only Added Installed Fraction is considered as one of the hardest parts of 1st math. Fractions for 1st grade is the absolutely free application helping kids to reinforce as well as to supplement knowledge of fractions by the scientific and attractive method which dominates worksheet so much.

Download this application right now to experience this wonderful one!

==========

Fractions for 1st grade includes lessons of simple fractions such as halves, thirds and fourths, the way to define equal parts and compare fraction. With three-part content designed as a lesson in the class, the application will give kids a firm foundation to develop well mathematic knowledge in the future.

The application consists of three parts:

Study: Teaching kids a range of new knowledge. With explanation enclosed with particular images, kids will easily be familiar with definitions and concepts of fractions

Practice: reinforce learned knowledge for kids. Kids will practice lessons relating to the content of lessons to understand better and remember longer them.

Quiz: examine again the lesson’s knowledge through experiencing a synthetic test in the certain period of time. Kids can affirm their ability with the grade that they gain.

==========

FEATURES

Lessons are illustrated with lively sounds as well as images to enhance kids’ concentration.

Lessons are classified according to topics and arranged from the easiest to hardest so it’s convenient for kids to study.

Lessons are shown as a game so it raises kids’ inspiration more than worksheet.

Lovely and simple interface helps kids to easily study by themselves.

The quality of graphics is high.

Be quick to download to get this free and useful application! Thank you for choosing us to be the partner with your children!

If you find this application really useful, please give 5 stars for it.

Download this application right now to experience this wonderful one!

==========

Fractions for 1st grade includes lessons of simple fractions such as halves, thirds and fourths, the way to define equal parts and compare fraction. With three-part content designed as a lesson in the class, the application will give kids a firm foundation to develop well mathematic knowledge in the future.

The application consists of three parts:

Study: Teaching kids a range of new knowledge. With explanation enclosed with particular images, kids will easily be familiar with definitions and concepts of fractions

Practice: reinforce learned knowledge for kids. Kids will practice lessons relating to the content of lessons to understand better and remember longer them.

Quiz: examine again the lesson’s knowledge through experiencing a synthetic test in the certain period of time. Kids can affirm their ability with the grade that they gain.

==========

FEATURES

Lessons are illustrated with lively sounds as well as images to enhance kids’ concentration.

Lessons are classified according to topics and arranged from the easiest to hardest so it’s convenient for kids to study.

Lessons are shown as a game so it raises kids’ inspiration more than worksheet.

Lovely and simple interface helps kids to easily study by themselves.

The quality of graphics is high.

Be quick to download to get this free and useful application! Thank you for choosing us to be the partner with your children!

If you find this application really useful, please give 5 stars for it.

1

Listen Read Device Only Added Installed ## Simply Fractions (Lite), Math

Simply LearningAid

1

Listen Read Device Only Added Installed Find Fractions too abstract? Is Math hard and boring? Not when you can see and play your way through the concept. Simply Fractions will help elementary school aged children understand and grasp the concept of fractions through hundreds of fun exercises.

Kids will be introduced to the concept of fractions through shapes like squares, circles, triangles, rectangles and polygons. Kids will also learn fractions of a set and fraction of a whole through the use of a beaker, and compare simple fractions. Also they will memorize the name of fractions with a fun memory game.

Fraction is a foundational concept in math, once it is seen and intereacted with, kids will find it more intuitive, not something boring and intimidating.

This app is designed for kids from Kindergarten through 3rd grade. The Full version has 7 different mini activities. The lite version has 3 mini activities, no ads are served.

This app is optimized for both phones and tablets.

keywords: kids fractions, math skills, learn fractions

Kids will be introduced to the concept of fractions through shapes like squares, circles, triangles, rectangles and polygons. Kids will also learn fractions of a set and fraction of a whole through the use of a beaker, and compare simple fractions. Also they will memorize the name of fractions with a fun memory game.

Fraction is a foundational concept in math, once it is seen and intereacted with, kids will find it more intuitive, not something boring and intimidating.

This app is designed for kids from Kindergarten through 3rd grade. The Full version has 7 different mini activities. The lite version has 3 mini activities, no ads are served.

This app is optimized for both phones and tablets.

keywords: kids fractions, math skills, learn fractions

1

Listen Read Device Only Added Installed ## Simply Fractions 3 (Lite)

Simply LearningAid

1

Listen Read Device Only Added Installed Simply Fractions 3 is designed for fourth and fifth grade elementary students to further their understanding of fractions, it is the next step from the Simply Fractions 2 app.

Kids will learn visually how to add, subtract simple or mixed fractions with like denominators, multiply fractions by a whole number, solve word problems, learn about 10th and 100th based decimals, convert fractions to these decimals, compare the decimals, and add 10th based fractions to 100th based fractions.

Kids will learn visually how to add, subtract simple or mixed fractions with like denominators, multiply fractions by a whole number, solve word problems, learn about 10th and 100th based decimals, convert fractions to these decimals, compare the decimals, and add 10th based fractions to 100th based fractions.

The Full version has eight different mini activities. The lite version has 2 mini activities, no ads are served in either versions.

Here is a summary of the games:

1. Add fractions with like denominators, drag all the fractional pieces from the second operand to the first to see the visual model, then key in the right value. There are 4 levels of difficulty, from simple fractions to mixed fractions. This activity with all levels is available in the lite version also.

2. Subtract fractions with like denominators, take the fractional parts from the first operand to see the visual representation, then key in the right values. There are two levels of difficulty.

3. Multiply fraction by a whole number, drag all the fractional parts to the result panel to see the visual help, then key in the right values. There are two levels of difficulty.

4. Word problems, solve real world problems involving fractions using the add, subtract and multiply skills learned.

5. 10th and 100th. In this game, you are asked to shade 10th or 100th based fractions, you can also set the format to decimals, English word notation, or convert 10th to 100th or vice versa. This activity with all options is available in the lite version also.

6. Learn number line for 10th or 100th fractions and decimals.

7. Decimal sequence, compare decimals to hundredths and put them in order.

8. Add 10th and 100th, express a fraction with denominator 10 as an equivalent fraction with denominator 100, and use this technique to add two fractions with respective denominators 10 and 100.

This app is optimized for both phones and tablets.

keywords: common core, fractions, third grade math, fourth grade math, fifth grade fractions,

1

Listen Read Device Only Added Installed ## Slice Fractions

Ululab

1

Listen Read Device Only Added Installed Make your child hungry for his or her next math discovery! Knowing that slicing games are incredibly fun, we teamed up with university education experts to craft a creative and new way to learn fractions.

+ "I found the game to be endearing and enjoyed watching my children play." tuaw.com

+ "Slice Fractions does a really great job of teaching without making it feel like a lesson." maclife.com

+ 5/5 "With over 60 puzzle screens, this app is a great value" bestappsforkids.com

+ 5/5 "It is truly an ingenious way to introduce fractions" theiphonemom.com

+ "The game is so fun, they won’t realize they are gradually learning about fractions." geekswithjuniors.com

+ "The app is well-constructed, well-designed, and the execution through the levels is very well considered, suiting young learners at all stages of primary education." ukedchat.com

+ "I found the game to be endearing and enjoyed watching my children play." tuaw.com

+ "Slice Fractions does a really great job of teaching without making it feel like a lesson." maclife.com

+ 5/5 "With over 60 puzzle screens, this app is a great value" bestappsforkids.com

+ 5/5 "It is truly an ingenious way to introduce fractions" theiphonemom.com

+ "The game is so fun, they won’t realize they are gradually learning about fractions." geekswithjuniors.com

+ "The app is well-constructed, well-designed, and the execution through the levels is very well considered, suiting young learners at all stages of primary education." ukedchat.com

You will enjoy:

+ Slicing through ice and lava to clear the mammoth’s path

+ Learning fraction concepts without words

+ An activity reviewed by researchers at a Canadian university (UQAM)

+ Collecting funky hats

+ Solving over 60 innovative physics puzzles

+ Playing in a safe, digital environment. No ads or in-app purchases.

The game covers the following fraction concepts:

+ Part-whole partitioning

+ Numerator / Denominator notation

+ Equivalent fractions

+ Fraction ordering

+ Subtracting fractions from 1

Teachers: Slice Fractions is based on the following Common Core concepts: (2.G.A.2) (2.G.A.3) (3.NF.A.1) (3.NF.A.3) (4.NF.A.1) (4.NF.A.2) (4.NF.B.3)

Important Note:

+ Finished the game? You can play again by pressing the Level Select button in the lower right corner of the main screen (the icon with six dots).

1

Listen Read Device Only Added Installed ## Simply Fractions 2 (Lite)

Simply LearningAid

1

Listen Read Device Only Added Installed Simply Fractions 2 is designed for second grade to fourth grade elementary students to further their understanding of fractions, it is the next step from the Simply Fractions app.

Kids will learn about mixed fractions, equivalent fractions, fractions on a number line, a fraction of a collection whose size is greater than the denominator, compare fractions with different numerators and denominators, but can be compared to either 0, 1/2 or 1. We use a scaffolding approach, where the concept is introduced visually first, later there will be games without visual aid to strengthen the concept learned.

The full version has eight different mini activities. The lite version has 2 mini activities, no ads are served in either versions.

Here is a summary of the activities:

1. Shade Fractions 2: Like in Simply Fractions 1, you are asked to shade the squares, but the number of squares is larger then the denominator. They are arranged so you can easily see the grouping.

2. Mixed Fractions: You are presented with circles and a fraction of a circle, you will have to put in the correct whole number, numerator, denominator and the equivalent simple fraction's numerator and denominator. Since you are asked to put in the number rather than choosing from multiple choices, guessing is minimized.

3. Number Line: You have to put in the numerator based on the position on the number line, hints are provided so you will see the fraction on the number line is the same as a fraction of a whole. You will compare the fraction to a half, so you will be prepared to do the harder part of the compare exercises.

4. Fraction of a Set 2: Like in Simply Fractions, you are asked to color a fraction of objects, but the number of objects is larger than the denominator. You can rearrange the objects into separate groups so you can color the right amount of them.

5. Equivalent Fractions: You are asked to put in the numerator to make an equivalent fraction based on the visual model presented.

Kids will learn about mixed fractions, equivalent fractions, fractions on a number line, a fraction of a collection whose size is greater than the denominator, compare fractions with different numerators and denominators, but can be compared to either 0, 1/2 or 1. We use a scaffolding approach, where the concept is introduced visually first, later there will be games without visual aid to strengthen the concept learned.

The full version has eight different mini activities. The lite version has 2 mini activities, no ads are served in either versions.

Here is a summary of the activities:

1. Shade Fractions 2: Like in Simply Fractions 1, you are asked to shade the squares, but the number of squares is larger then the denominator. They are arranged so you can easily see the grouping.

2. Mixed Fractions: You are presented with circles and a fraction of a circle, you will have to put in the correct whole number, numerator, denominator and the equivalent simple fraction's numerator and denominator. Since you are asked to put in the number rather than choosing from multiple choices, guessing is minimized.

3. Number Line: You have to put in the numerator based on the position on the number line, hints are provided so you will see the fraction on the number line is the same as a fraction of a whole. You will compare the fraction to a half, so you will be prepared to do the harder part of the compare exercises.

4. Fraction of a Set 2: Like in Simply Fractions, you are asked to color a fraction of objects, but the number of objects is larger than the denominator. You can rearrange the objects into separate groups so you can color the right amount of them.

5. Equivalent Fractions: You are asked to put in the numerator to make an equivalent fraction based on the visual model presented.

6. Compare: There are two modes, easy and hard. But in both modes you will need to rearrange the fractions into the right order. The easy mode, you will be asked to compare fractions with either the same numerators or the same denominators, these concepts were introduced in Simply Fractions, but here no visual aid is provided. The hard mode, the numerators and denominators are different, but they can be compared to a half, this is a crucial comparison strategy at this age.

7. Odd one out: You are provided with 4 fractions, you are to eliminate the one that is different than the other three equivalent fractions.

8. Equivalent memory: A classic memory game where you find pairs of equivalent fractions, this will strengthen the equivalent fractions skills.

No kids should feel dumb because they don't understand math, many times we fail them because we let them learn the next concept before they grasped the first concept. We hope to instill confidence and joy in children as they travel the long educational journey.

This app is optimized for both phones and tablets.

Keywords: common core, fractions, second grade math, third grade math and fourth grade math

1

Listen Read Device Only Added Installed ## Fractions Practice

Dr Mark Jones (PhD Maths)

1

Listen Read Device Only Added Installed Hi Guys,

This is a Smart Worksheet on Fractions. A lot of people, both young and old, often struggle with one aspect or another of working out fractions. The sheet covers, converting improper and proper fractions, addition and subtraction as well as multiplication and division.

It is designed so that you have a go first and then click on the question to open the video solution to check you answer. There are tutorial videos interspersed in the sheet just before you try the section of questions.

There are resets and a whole host of useful tools so that you can keep a track of your progress as you work through.

Hope you enjoy and any feedback is always appreciated. Cheers, Mark

1

Listen Read Device Only Added Installed ## Chicken coop fractions games

Lumpty Learning

1

Listen Read Device Only Added Installed Learn to ace fractions with this suite of hilarious chicken-themed educational games.

This resource is already used in thousands of schools to help children develop methodologies for rapidly solving problems involving fractions.

Rocket rooster: adding fractions

Improve your ability to add fractions as you choose the right set of rockets to fire Ernie into the nest. In this hilarious game there are fifty levels to complete and each one will help you get to grips with addition and multiplication of fractions.

Simply-frying fractions: simplifying fractions

Help kung fu chicken in his quest to simplify fractions by finding the common factors of the numerator and denominator. You will need to be a black belt at finding highest common factors to get a good score.

Bad egg: equivalent fractions

Smash the rotten egg by clicking on the fraction that is not equivalent to the others. By playing this game your students will develop a variety of mental strategies that help them to identify equivalent fractions.

Chicken coop painter: comparing fractions

Use your knowledge of fractions to paint a chicken coop according to the hen's instructions! This clever game will teach your students to visualise and compare the value of different fractions.

Chicken coop game: estimating fractions

You will be shown a fraction and your job is to estimate the decimal equivalent by placing a nest on a number line. Our hens are mathematical experts and they will fire their eggs towards the correct answer. If your estimate is good the eggs will be caught in the nest but if you're too far out it all gets very messy.

Reviewed by appolearning as the best app for teaching fractions at middle school!

1

Listen Read Device Only Added Installed ## O Smart Math - Fractions 1.0

O'Smart Games

1

Listen Read Device Only Added Installed Unbelievable! New discovery how to learn by playing!

If you need to pass the test in math about fractions, you’re in the right place! Game combines science, learning and fun! Jump into the game today and experience learning in a whole new way.

If you need to pass the test in math about fractions, you’re in the right place! Game combines science, learning and fun! Jump into the game today and experience learning in a whole new way.

- This game is 5 times more efficient than learning with standard exercises – you will pass the test even if playing it for 40 minutes;

- You don't like to learn? From today you will love math!

- Well-known and captivating game gameplay mean's learning is fun!

The game includes following study material:

• Fractions – Grade 1, 2 and 3

1

Listen Read Device Only Added Installed ## Fractions

Cool Education Apps

1

Listen Read Device Only Added Installed The absolute and compete app about Fractions!

This is the most amazing app you will find when it comes to information about math fractions.

Get the latest updates, news, information, videos, photos, events and amazing deals for learning fractions app lovers.

Download this app now!

A fraction (from Latin: fractus, "broken") represents a part of a whole or, more generally, any number of equal parts. When spoken in everyday English, a fraction describes how many parts of a certain size there are, for example, one-half, eight-fifths, three-quarters.

Discover everything you want to know about Fractions! Download and get this app to have these exclusive features!

- A continuous, up-to-date unstoppable gush of news and information about fractions and decimals.

- Like and comment on fractions calculator articles, images, audio and videos.

- The latest Fractions products and deals!

- Read the latest articles and feedback on Fractions.

- Beat all your friends with Fractions best deals.

- Share Fractions news, photos, events, and other news through Twitter, Facebook and e-mail.

Disclaimer:

* All trademarks and copyrights are owned by their respective owners.

* This Fractions app will add a new icon onto your home screen that links to a mobile web page which helps fund and promote the development of this Fractions app. If you do not want to use this amazing resource, you can either ignore it or delete it. If you do use it, we greatly appreciate your support.

1

Listen Read Device Only Added Installed 1

Listen Read Device Only Added Installed ## Squeebles Fractions

Keystagefun

1

Listen Read Device Only Added Installed The Squeebles are back again, this time to help with your children's fractions.

☆ The Squeebles games have been featured on BBC Radio, as well as in The Daily Telegraph, The Observer, The Guardian and more.

Featuring 4 mini games, a great reward scheme involving cakes (and we all love cakes), several difficulty levels and unlimited players this Squeebles game will make the task of learning fractions a LOT more fun.

The game is aimed at 7-11 year olds but can be used by anyone who wants to brush up on their fractions in a fun way.

Features:

☆ 4 mini games aimed at helping children learn fractions:

- A Piece of Cake: drag different fractions of cakes to each Squeeble as they ask for them. Easy mode covers halves, quarters and thirds with hard mode covering fractions up to tenths.

- Tricky Pairs: match fractions of the same value (i.e.: 1/2 matches with 3/6) as quickly as possible. Easy mode features 4 pairs and hard mode features a whopping 9 pairs!!!

- Think Big: drag the cake to the Squeeble who calls out the largest fraction. Easy mode covers halves, thirds and quarters. Hard mode covers fractions up to twelfths.

- Super Sums: Answer 10 of the Maths Monster's fractions questions as quickly as possible. Easy, medium and hard modes.

☆ UK or US English

☆ Universal app runs on both iPad and iPhone / iPod Touch

☆ Great reward system and storyline. The Squeebles want to enter the Cake Making Contest but The Maths Monster has stolen all their ingredients and their entry tokens. You have to help the Squeebles win back their ingredients and tokens by working through the four fractions mini-games. You can then make cakes from over 100 ingredients and enter them into the contest!

☆ Over 100 cake ingredients from delicious sweet classics like toffee sauce and chocolate flakes to bizarre Squeeble favourites like curry sponge and sugared carrots!

☆ Covers fractions from halves to twelfths.

☆ Win trophies for doing well in games.

☆ Features 10 of the Squeebles characters, including Whizz, Lex and the nasty Maths Monster.

☆ Set up unlimited players, making this app perfect for classroom use as well as home use.

☆ Makes learning fractions fun!!!

☆ No in-app purchases, advertising or web links mean all our apps are 100% safe for your children to use.

Other Squeebles apps include Times Tables, Spelling, Addition & Subtraction and Division.

1

Listen Read Device Only Added Installed ## Simply Fractions, math games

Simply LearningAid

1

Listen Read Device Only Added Installed Find Fractions too abstract? Is Math hard and boring? Not when you can see and play your way through the concept. Simply Fractions will help elementary school aged children understand and grasp the concept of fractions through hundreds of fun exercises.

Kids will be introduced to the concept of fractions through shapes like squares, circles, triangles, rectangles and polygons. Kids will also learn fractions of a set and fraction of a whole through the use of a beaker, and compare simple fractions. Also they will memorize the name of fractions with a fun memory game.

Fraction is a foundational concept in math, once it is seen and intereacted with, kids will find it more intuitive, not something boring and intimidating.

This app is designed for kids from Kindergarten through 3rd grade. The Full version has 7 different mini activities. The lite version has 3 mini activities, no ads are served.

This app is optimized for both phones and tablets.

keywords: kids fractions, math skills, learn fractions

Kids will be introduced to the concept of fractions through shapes like squares, circles, triangles, rectangles and polygons. Kids will also learn fractions of a set and fraction of a whole through the use of a beaker, and compare simple fractions. Also they will memorize the name of fractions with a fun memory game.

Fraction is a foundational concept in math, once it is seen and intereacted with, kids will find it more intuitive, not something boring and intimidating.

This app is designed for kids from Kindergarten through 3rd grade. The Full version has 7 different mini activities. The lite version has 3 mini activities, no ads are served.

This app is optimized for both phones and tablets.

keywords: kids fractions, math skills, learn fractions

1

Listen Read Device Only Added Installed 1

Listen Read Device Only Added Installed ## Simplify Fractions Calculator

GK Apps

1

Listen Read Device Only Added Installed This free math calculator is able to simplify fractions. Just enter the fraction, click the button and the app will simplify.

Best mathematical tool for school and college! If you are a student, it will helps you to learn arithmetics and calculations with fraction numbers.

Note: A common fraction can be reduced to lowest terms by dividing both the numerator and denominator by their greatest common divisor.

1

Listen Read Device Only Added Installed ## Graph It!

FEMA

1

Listen Read Device Only Added Installed GraphIt is a utility that is used to display on a Cartesian plane any mathematical function, which can be f(x)=2, f(x)=2*x, f(x)=sin(x) ecc... The management function is entrusted to you: you can add more or modify existing ones.

The integration of functions is facilitated by self-completion of statements, also expressions of the interpreter is very flexible and allows the inclusion of any function: even the most complex are recognized and interpreted correctly.

The main functions recognized are: abs(x), acos(x), acosh(x), asin(x), asinh(x), atan(x), avg(x1,x2,...,xN), ceil(x), combin(x,y), cos(x), cosh(x), e(), exp(x), fact(x), floor(x), lg(x), ln(x), log(x,y), max(x1,x2,...,mN), min(x1,x2,...,xN), mod(x,y), pi(), pow(x,y), rand(), sign(x), sin(x), sinh(x), sqrt(x), sum(x1,x2,...,xN), tan(x), tanh(x), toDeg(x), toRad(x).

The graph allows an accurate view of the trend of function at any point in the plane. You can zoom and pan through the classical gestures.

There is also a tool which can calculate the value of the functions included, given the value of x (via a number or expression).

1

Listen Read Device Only Added Installed # More from developer

## Time Calculator

nummolt

1

Listen Read Device Only Added Installed Elapsed / 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

1

Listen Read Device Only Added Installed ## How much pizza to order?

nummolt

1

Listen Read Device Only Added Installed 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

1

Listen Read Device Only Added Installed ## Touch Pythagoras

nummolt

1

Listen Read Device Only Added Installed Touch Pythagoras:

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

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

App:

You can change the lengths of the legs (dragging).

You can change the length of the hypotenuse with two fingers.

You can 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.

You can 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 6 solutions:

3² + 4² = 5²

5² + 12² = 13²

6² + 8² = 10²

8² + 15² = 17²

9² + 12² = 15²

12² + 16² = 20²

Likewise it is also possible to find the solutions below 31 (11 solutions in all)

Or solutions below 101 (52 solutions in all)

(Or maybe the 127 exact results under 201 in the best tablets)

Touch Math Apps:

http://www.nummolt.com

MathTools reference of this app:

http://mathforum.org/mathtools/tool/206418/

Math 4 Triangles

Math 6 Geometry in the plane, Triangles, Pythagorean theorem

Math 7 Geometry in the plane, Triangles, Pythagorean theorem, Quadrilateral properties

Geometry Triangles, Right, Right Triangles, Special right triangle, Pythagorean theorem, Trigonometry

Algebra Exponents

Algebra II General

Trigonometry Right Triangles

From here we recomend the web page about the Pythagorean Theorem of Alexander Bogomolny:

http://www.cut-the-knot.org/pythagoras/index.shtml

(Shows 101 proofs of the Pythagorean Theorem)

1

Listen Read Device Only Added Installed ## Adding apples and oranges

nummolt

1

Listen Read Device Only Added Installed Educational app about adding apples and oranges.

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

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.

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

1

Listen Read Device Only Added Installed ## 9 digits

nummolt

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Listen Read Device Only Added Installed The game is about to find solutions ordering the numbers 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.

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

1

Listen Read Device Only Added Installed ## Circadian clock

nummolt

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Listen Read Device Only Added Installed 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

Note 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.

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Listen Read Device Only Added Installed ## Beam

nummolt

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Listen Read Device Only Added Installed Calculation of bending a steel beam.

You can find a web version of this program:

http://arquitectes.coac.net/mcj

App Catalan language, and with steel profiles Europeans and Spaniards.

1

Listen Read Device Only Added Installed ## Apples and oranges 1 decimal

nummolt

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Listen Read Device Only Added Installed 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.

// Warning:

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

// Note:

Buying this program will help the realization of new content for nummolt.com.

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Listen Read Device Only Added Installed