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Tool: Touch Natural Numbers
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Go to: http://play.google.com/store/apps/details (opens a new window)
Description: With this app you can:
  • analyze the factors of a composite number.
  • build a composite number from its factors (multiplication and division of natural numbers).
  • localize or select a number in the Ulam Spiral. (Only prime numbers have a color in this spiral).
  • verify all the possible products between primes in a composite number with the parabolic sieve.
  • analyze or build a number with the place value activity (addition and subtraction of natural numbers).
  • understand the modulo of a number.
  • know about polygonal numbers and the numbers as the sum of two prime numbers, and as the sum of three prime numbers.
Technology Type: Android 
Guide: User's Guide (opens a new window)
Author: Maurici Carbó
Language: English 
Cost: Does not require payment for use

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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