1. 8 7/9 - 45/6 =… 2. 6/8 - 3/16 =… 3. 3 10/15 + 15/20 =… 4. 3 3/12 + 4 5/8

1. 79/9 - 45/6 = 158/18 - 135/18 = 23/18
2. 12/16 - 3/16 = 9/16
3. 55/15 + 15/20 = 1100/300 + 225/300 = 1325/300 = 53/9
4. 39/12 + 37/8 = 78/24 + 111/24 = 189/24 = 63/8