To multiply fraction you need to write then out.

Eg. 2/4 X 3/10

without a calculator you can cancel to help.

The opposite top and bottom numbers can cancel down...

In this example. The fist 2 and last 10 can cancel down

1/4 X 3/5

the simply times the two top together 1 X 3 =3

_

then the two bottom numbers ...4 X 5 =20

so answer for this would be 3/20

or 15% etc.

Eg. 2/4 X 3/10

without a calculator you can cancel to help.

The opposite top and bottom numbers can cancel down...

In this example. The fist 2 and last 10 can cancel down

1/4 X 3/5

the simply times the two top together 1 X 3 =3

_

then the two bottom numbers ...4 X 5 =20

so answer for this would be 3/20

or 15% etc.