1) 3/4 + 3/20 = 15/20 + 3/20 = 18/20
2) 7/10 + 3/20 = 14/20 + 3/20 = 17/20
3) 2/7 + 4/35 = 10/35 + 4/35 = 14/35
4) 21/32 + 1/8 = 21/32 + 4/32 = 25/32
5) 19/100 + 7/10 = 19/100 + 70/100 = 89/100
6) 63/100 + 37/100 = 100/100 = 1
7) 3/10 + 77/1000 = 300/1000 + 77/1000 = 377/1000
8) 43/10000 + 81/100 = 43/10000 + 8100/10000 = 8143/10000
