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The way to get equivalent fractions is to multiply the numerator and the denominator by the same number.

4 x 3 = 12

5 x 3 = 15

4/5 = 12/15

In reverse...

The way to reduce fractions is to find the GCF of the numerator and denominator and divide them by it. The GCF of 12 and 15 is 3.

12/3 = 4

15/3 = 5

The GCF of 4 and 5 is 1. That's how you know 4/5 is in its simplest form.

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Q: Why is 4 over 5 the answer to 12 over 15?
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