Nine fifteenths in simplest form is three fifths. Since the Greatest Common Factor (GCF) they have is 3 (you may make a 'T' chart or a Factor Tree to find out), divide the numerator (top number of fraction) and the denominator (bottom number of fraction) both by three. So the simplest form of nine fifteenths is three fifths.
2/3
3/5 :)
1/3
3/5
1/5
9/15 = 3/5 in its simplest form.
2/3
2/3
9/15 = 3/5
There are many, but the simplest form is 1/3
1/3