Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 167 · 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 44 × 22 = 965 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 18 × 99 = 1788 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 688 + 183 = 863 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 93 × 28 = 2604 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 22 × 24 = 536 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 725 + 896 = 1620 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 34 × 56 = 1904 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 886 + 356 = 1247 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 156 + 111 = 267 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 752 + 315 = 1073 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 18 × 37 = 666 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 30 × 58 = 1732 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 870 + 711 = 1587 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 38 × 90 = 3420 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 99 × 13 = 1287 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 45 × 85 = 3825 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 84 × 74 = 6221 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 627 + 752 = 1379 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 178 + 571 = 740 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 80 × 64 = 5124 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 128 + 355 = 483 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 384 + 237 = 629 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 83 × 13 = 1087 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 574 + 279 = 857 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 41 × 89 = 3649 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 242 + 636 = 878 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 106 + 330 = 435 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 52 × 50 = 2600 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 818 + 911 = 1735 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 58 × 16 = 922 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 86 × 23 = 1976 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 73 × 51 = 3729 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 27 × 29 = 787 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 61 × 15 = 922 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 276 + 629 = 905 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 19 × 13 = 247 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 20 × 50 = 1000 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 37 × 16 = 592 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 20 × 75 = 1500 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 29 × 15 = 435 right or wrong? (a) Right (b) Wrong

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