Is the sum for 3 1/8 + 2 5/8 5 6/8 or 5 5/8
3 1/8 + 2 5/8 3 + 2 = 51/8 + 5/8 = 6/8No need to change denominator since its 8 for both. 5 6/8Now 6/8 can be reduced to 3/4 if needed.