How do you multiply fractions with cross canceling

3 9

_ * _

15 6

Compare diagonally to see if they the 2 numbers simplify.

Ex:

3 and 6 Simplify to 1 and 2 because they are both multiples of 3.

9 and 15 Simplify to 3 and 5 because they are both multiples of 3 as well.

Now our fractions are

1 3

_ * _

5 2

Now multiply across to get your final fraction/answer

3

_

10