Best Answer

1/3

Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 15, 15/45 is equal to 1/3 or one third.

It's 1/3 since 15 is one third of 45.

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45/15 = 3/1 = 3

Q: What is 45 over 15 in simplest form?

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