Find the missing number (add and subtract within 100)

Find the missing number (addition and subtraction within 100) is a skill in the early math section, to master it you have to get 5 problems correct.

Example problem
60  =  ? + 38 

How to solve
To solve 60 = ? + 38, you subtract 38 from 60, which is 22, which is the answer, 60 = 22 + 38