Demonstrate how addition and subtraction are inverse operations

1. 36 + 12 = 48 So what else is true?
2. Complem. add/subtract: 136+419=555
3. Complem. add/subtract: 216+84=300
4. Complem. add/subtract: 112+32=144
5. Complem. add/subtract: 125+14=139
6. Complem. add/subtract: 105+24=129
7. Complem. add/subtract: 210+14=224
8. Comp. pairs add/subtract: 678+156=834
9. Comp. pairs add/subtract: 246+357=603
10. Comp. pairs add/subtract: 545+328=873
11. Comp. pairs add/subtract: 488+323=811
12. Comp. pairs add/subtract: 493+257=750
13. Complementary pairs: 347+454=801
14. Complementary pairs: 482+395=877
15. Complementary pairs: 278+596=874
16. Complementary pairs: 532+209=741
17. Complementary pairs: 627+277=904
18. 12 + 7 = 19 - so what else is true?
19. Complem. add/subtract: 652-547=105
20. Complem. add/subtract: 845-69=776
21. Complem. add/subtract: 492-116=376
22. Complem. add/subtract: 831-88=743
23. Complem. add/subtract: 634-97=537
24. Complem. add/subtract: 263-84=179
25. Complem. add/subtract: 751-47=704
26. Complem. add/subtract: 397-59=338