Question

Rafi has a board of 15 1/2 feet long. He cut three pieces of the board that are each 3 7/8 feet long. How much of the board is left?

Answer 1

The answer to the problem is 3 7/8

Answer 2

3 7/8 is left.

multiple 3 7/8 by 3 since there's 3 pieces cut.
then subtract 15 1/2 by 11 5/8 (the sum of the 3 boards) and you get your answer.