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Fractions Fundamentals: Prime Numbers and Factoring

Learning about prime numbers will help you write large fractions in their smallest form. When is a number a prime number? When it can be divided only by itself and the number 1.

Is 2 a prime number? 2 can be divided only by 1 and by itself (2). 2 is a prime number:
2 ÷ 1 = 2
2 ÷ 2 = 1

Is 3 a prime number? 3 can be divided only by 1 and by itself (3). 3 is a prime number:
3 ÷ 1 = 3
3 ÷ 3 = 1

Is 4 a prime number? 4 can be divided by 1, 2, and by itself (4). Therefor, 4 is not a prime number:
4 ÷ 1 = 4
4 ÷ 2 = 2
4 ÷ 4 = 1

The above examples show factoring: making a list of all numbers that can be divided by a number.

Note: according to mathematicians, 1 is not a prime number.

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