Tuesday, June 14, 2022

Adding Unit Fractions - Google Play

 Adding Unit Fractions


 https://play.google.com/store/apps/details?id=com.nummolt.fractions.add

The app proposes 21 challenges to overcome.
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 lower unit fraction used in this app is 1/28.


The app allow to decompose  2/3, 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.

The app works right in Android  TV devices.


3/7 Only 1 solution with 1/28 as the tiniest available unit fraction


8/9 Only 1 solution with 1/28 as the tiniest available unit fraction


 

Monday, June 13, 2022

Measure Fractions - Google Play

 Measure Fractions


 https://play.google.com/store/apps/details?id=com.nummolt.measure.fraction

 

 Measure fractions:

The 4 elementary operations with fractions:

3/2 + 4/3 = 17/6 
4/3 - 5/4 = 1/12;  5/4 + 1/12 = 4/3 
4/5 * 3/2 = 6/5 
(6/5) / (3/2) = 4/5

 


 

Explore adding unit fractions:

Akhmin Papyrus n/17 

Table Adding Unit Fractions: 

2/17 = 1/12 + 1/51 + 1/68 
3/17 = 1/12 + 1/17 + 1/51 + 1/68 
4/17 = 1/12 + 1/15 + 1/17 + 1/68 + 1/85 
5/17 = 1/4 + 1/34 + 1/68 
6/17 = 1/3 + 1/51 
7/17 = 1/3 + 1/17 + 1/51 
8/17 = 1/3 + 1/15 + 1/17 + 1/85 
9/17 = 1/2 + 1/34 
10/17 = 1/2 + 1/17 + 1/34 
11/17 = 1/2 + 1/12 + 1/34 + 1/51 + 1/68 
12/17 = 1/2 + 1/12 + 1/17 + 1/34 + 1/51 + 1/68 
13/17 = 1/2 + 1/4 + 1/68 
14/17 = 1/2 + 1/4 + 1/17 + 1/68 
15/17 = 1/2 + 1/3 + 1/34 + 1/51 
16/17 = 1/2 + 1/3 + 1/17 + 1/34 + 1/51
 
 
 
Adding unit fractions:
1 = 1/4 + 1/5 + 1/6 + 1/9 + 1/10 + 1/15 + 1/18 + 1/20



Measure Fractions: Youtube playlist:

Sunday, June 12, 2022

Calculadora Natural - Google Play

 Calculadora Natural:


 

https://play.google.com/store/apps/details?id=com.nummolt.calculadora.natural

Calculadora Natural Long Scale in Spanish
This is the Whole Calculator in the SPANISH and LONG SCALE version:
NOT USEFUL IN ENGLISH !!!

Los numeros naturales representados también en letras. 

Es una calculadora de enteros.

La división muestra el resto. 

No trabaja con fracciones ni con números decimales.

 

Spanish:


 

 Català:


 

 Calculadora de enteros Escala larga (Miles de millones en vez de billions)


 

 Video: Cómo es un Centillón? (10^600):


 

Calculadora Natural en català:


 

Privacy Policy:

https://nummolt.blogspot.com/2022/06/privacy-policy-calculadora-natural.html

Saturday, June 11, 2022

Pythagoras Explore - Google Play

 Pythagoras Explore:


 https://play.google.com/store/apps/details?id=com.nummolt.pythagoras.explorer

 

Pythagorean Triples
6 proofs and visualizations of Pythagorean Theorem:
 

Units


 


Euclid


 


Equivalent Squares


 


Perigal - Dudeney
 


Da Vinci
 


Bhaskara 


Promotional Video:


Privacy Policy:

https://nummolt.blogspot.com/2022/06/privacy-policy-pythagoras-explore.html

Friday, June 10, 2022

Proportion and Slope - Google Play

 

 https://play.google.com/store/apps/details?id=com.nummolt.proportion.slope.cross.multiplication

Proportion and Slope 


It focuses on graphically showing the idea of proportion, and the equivalent fractions for solving directly proportional problems.
Attempts to show what is routinely done with cross multiplication.Shows the slope, the ratio, the proportion between two numbers, and allows applying that proportion to other numbers, whether they are greater or less than the initial one.
 
Graphically the proportion is fixed with the red bars.  
The blue dot slides down the slope fixed by the proportion


 

Promotional Video:


 

Privacy Policy: 

Wednesday, June 8, 2022

Apples and oranges 1 decimal - Google Play

 Apples and Oranges 1 decimal


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

 

Basic tool to learn algebra.
Trying solving a system of linear equations with two equations and two unknown variables. (Two purchases and two fruits)

5 ways to solve:

Gauss-Jordan elimination:

 
Graphic
 

 
Two weighing scales

 
Cramer's rule
 

 
 
 
Inverse matrix
 

 
Apples and oranges Video:
 
 

 
Apples and oranges 1 Decimal:  Privacy Policy:

Tuesday, June 7, 2022

Place Value Time - Google Play

Place Value Time: 

 

 https://play.google.com/store/apps/details?id=com.nummolt.time.place.value

Time Calculator Place Value Time elapsed or countdown between two dates
Paid version of nummolt's Time Calculator:

(https://play.google.com/store/apps/details?id=com.nummolt.time.calc

Made with the idea of visually checking the calculations of Time Calculator.


And display the time of in place value format.

Video of Place Value Time:


Privacy Policy:

https://nummolt.blogspot.com/2022/06/privacy-policy-place-value-time.html

Monday, June 6, 2022

Circadian Clock Live Wallpaper - Google Play

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

 

Circadian Clock Live Wallpaper

Clock that works with planetary mechanisms. Indicates the seconds, minutes, hours, day and night and the day of the week.

It is the live wallpaper version of the Circadian Clock interactive and zoomable. 

(https://play.google.com/store/apps/details?id=com.nummolt.planetary.gear.watch

Circadian Clock Live Wallpaper:   Video:


 

Privacy Policy: 

https://nummolt.blogspot.com/2022/06/privacy-policy-circadian-clock-wallpaper.html 

Friday, June 3, 2022

Math Garden - Google Play

 

 

https://play.google.com/store/apps/details?id=com.nummolt.kinder.garden.math_serialized


Math Garden +
In this app, natural numbers are represented as vegetables (plants):

Each number is a graph tree with prime factors in the nodes.

Plants similar to:
Dandelions, (from French: 'dent-de-lion')


Seeds fall from the sky
They should be planted. And then grow the plant corresponding to the seed (and the number chosen).

When the plant is plucked from the ground, dandelions return to the sky.

When two seeds overlap on the ground they add up.  

When two buried seeds overlap, they multiply. The result of the multiplications does not depend on the order of their superposition. But different arrangements make trees with different shapes.

The different possible shapes of 105:

(3*5*7; 3*7*5; 5*3*7; 5*7*3; 7*3*5; 7*5*3)


The app allows to add, subtract, multiply and divide whole numbers. And you can also add, multiply and divide rational numbers. Rational numbers are made in the Fraction Building Tool on the left.


Pythagorean triples Video:


Math Garden Youtube Playlist: 

https://www.youtube.com/playlist?list=PLo4AMY8jDHYZ-bkLLmzFDdAMH2EcwMG8i


 The numbers created during the day are positive and those created at night are negative.

 

Dragging the screen up and down changes the current furrow.


The app allows you to displace, save and harvest the plants planted in their own furrow.

 

Privacy Policy:

https://nummolt.blogspot.com/2022/06/privacy-policy-math-garden.html

Wednesday, June 1, 2022

Equivalent Fractions - Google Play

 https://play.google.com/store/apps/details?id=com.nummolt.equivalent.fractions.rebuild

 

The target of the app is to find two fractions equivalent to the initial one.  


 Fractions can be raised manually, or by accepting an automated list to solve.
 

There are two options: Equivalent fractions with circles or with squares.

In the square you can add more or less partitions with the 'pinch zoom' vertically or horizontally.

There is a list of the correct results obtained:

 

(In the general main menu there's a inner list of last 50 right results)

 In the general menu you can increase or decrease the difficulty of the problems raised.



Promotional video:


Privacy Policy:

https://nummolt.blogspot.com/2022/06/privacy-policy-equivalent-fractions.html