Compute Each Sum or Difference

A. 2/3 + 1/5

B. 7/8 - 1/4

C. 1 2/3 + 3 1/4

D. 7 - 3 2/5

A. 2/3=10/15 & 1/5=2/15 so 10/15+2/15=12/15 which equals 4/5

B. 7/8 & 1/4=2/8 so 7/8-2/8=5/8

C. 1 2/3=20/12 & 3 1/4=39/12 so 20/12+39/12=59/12 which equals 4 11/12

D. 7=35/5 & 3 2/5=17/5 so 35/5-17/5=18/5 which equals 3 3/5