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Tool: Touch Integers ℤ (+ - × ÷)
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Go to: https://play.google.com/store/apps/details (opens a new window)
Description: The fundamental theorem of arithmetic, also known as the unique factorization theorem or the unique-prime-factorization theorem, states that every integer greater than 1 either is prime itself or is the product of prime numbers, and that this product is unique, up to the order of the factors. With this app you can add, subtract, multiply and divide (integer division: Division with remainder, not available) of any integer of any sign.
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: Kindergarten Operations with numbers, Place value
Math 1 Operations with numbers, Place value
Math 2 Operations with numbers, Place value
Math 3 Operations with numbers, Number sense
Math 4 Operations with numbers, Number sense, Number theory, Integers
Math 5 Operations with numbers, Number sense, Number theory, Integers
Math 6 Operations with numbers, Number sense, Number theory, Integers
Math 7 Operations with numbers, Number sense, Number theory
Algebra Number Systems, Integer Operations