If you start with a board that is 2 3/8" wide and you trim off (cut off) 1 1/4", how wide will your board be?

1 1/8"

Step-by-step explanation:

First, make a common denominator.

1 1/4 = 5/4 * 2/2 = 10/8 = 1 2/8

2 3/8 and 1 2/8

Then, subtract.

2 - 1 = 1

3/8 - 2/8 = 1/8

1 1/8"