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 |