Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 979 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 723 + 951 = 1667 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 656 + 334 = 984 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 35 × 29 = 1015 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 80 × 14 = 1120 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 31 × 62 = 1922 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 135 + 865 = 1000 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 787 + 376 = 1161 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 30 × 75 = 2256 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 50 × 57 = 2850 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 79 × 80 = 6324 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 86 × 85 = 7310 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 47 × 78 = 3668 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 72 × 32 = 2304 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 748 + 266 = 1014 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 147 + 476 = 630 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 860 + 715 = 1579 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 49 × 70 = 3430 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 65 × 95 = 6175 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 27 × 53 = 1426 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 829 + 331 = 1160 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 64 × 86 = 5504 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 89 × 14 = 1246 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 51 × 60 = 3060 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 553 + 960 = 1513 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 17 = 901 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 88 × 83 = 7304 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 370 + 906 = 1276 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 74 × 59 = 4366 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 44 × 84 = 3696 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 13 × 77 = 1001 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 232 + 239 = 471 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 95 × 72 = 6840 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 63 × 41 = 2590 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 51 × 84 = 4284 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 79 × 59 = 4669 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 373 + 269 = 642 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 61 × 92 = 5607 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 98 × 17 = 1671 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 77 × 39 = 3003 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 84 × 80 = 6720 right or wrong? (a) Right (b) Wrong

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