2/8 x 3/8 =
What is 6/8 or 3/4.
5/16 - 1/16 =
What is 5/16.
2/20 x 4/20 =
What is 8/20 or 4/10.
3/15 x 6/15 =
What is 18/15 or 1 3/15.