How much pizza to order?

nummolt

- January 7, 2014

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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

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# Reviews

Helpfulness

Newest

Rating

Helpfulness

All Versions

All Versions

Latest Version

3.0

2 total

5 1

4 0

3 0

2 0

1 1

User reviews

What's New

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

January 7, 2014

Size

3.3M

Installs

500 - 1,000

Current Version

1.3

Requires Android

2.2 and up

Content Rating

Everyone

Contact Developer

# Similar

## 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 1

Listen Read Device Only Added Installed # More from developer

## Touch Fraction

nummolt

1

Listen Read Device Only Added Installed 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

1

Listen Read Device Only Added Installed ## 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 ## 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

1

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 ## Beam

nummolt

1

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 ## Circadian clock

nummolt

1

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.

1

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

nummolt

1

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