Question

I need 20 strings of 3/8inches each. If I have a string 4 and 7/8inches how much more do I need?

Answer 1

to get the answer you need to do 20* 3/8 and subtract that from 4 7/8

20* 3/8 is 7 1/2 inches of string 

4 7/8 subtracted from 7 1/2 

2 5/8 is your answer :)