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