+23254 What is the missing digit in the problem: 5 1/8 - 3 ?/8 = 1 3/8?
Let's change the problem slightly to this: 5 1/8 - x = 1 3/8
To find the unknown x: 5 1/8 - 1 3/8 = x
---> 5 1/8 - 1 3/8 = 5 + 1/8 - 1 - 3/8 = (4 + 1) + 1/8 - 1 - 3/8 = (4 + 8/8) + 1/8 - 1 - 3/8
= 4 + (8/8 + 18) - 1 - 3/8 = 4 + 9/8 - 1 - 3/8 = (4 - 1) + (9/8 - 3/8) = 3 + 6/8
---> the missing digit is 6
