1. 98 + 12 = 12 + 98
2. (32 + 45) + 15 = 32 + (45 + 15)
3. 0 + 189 = 189
4. 34 + 67 = 67 + 34
5. 100 + 0 = 100
6. 26 + 67 = 67 + 26
7. (89 + 111) + 27 = 89 + (111 + 27)
8. 125 + (356 + 487) = ( 125 + 356) + 487
9.389 + 0 = 389
10. 987 + 548 = 548 + 987
