Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 734 · 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 438 + 422 = 860 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 52 × 59 = 3069 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 77 × 52 = 4004 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 87 × 36 = 3128 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 14 × 98 = 1372 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 66 × 86 = 5676 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 37 × 56 = 2072 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 352 + 864 = 1216 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 376 + 135 = 502 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 62 × 28 = 1743 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 638 + 824 = 1462 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 93 × 83 = 7719 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 31 × 36 = 1116 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 520 + 945 = 1465 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 852 + 298 = 1150 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 37 × 20 = 749 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 756 + 700 = 1465 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 60 × 94 = 5640 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 916 + 527 = 1443 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 894 + 822 = 1716 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 19 × 85 = 1621 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 70 × 20 = 1400 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 23 × 71 = 1633 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 22 × 93 = 2042 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 54 × 72 = 3888 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 46 × 51 = 2346 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 235 + 165 = 409 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 94 × 43 = 4042 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 973 + 936 = 1909 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 870 + 429 = 1296 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 30 × 94 = 2828 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 98 × 14 = 1372 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 410 + 502 = 915 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 66 × 76 = 5016 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 14 × 12 = 171 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 718 + 927 = 1645 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 636 + 520 = 1156 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 49 × 42 = 2059 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 139 + 524 = 663 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 22 × 70 = 1541 right or wrong? (a) Right (b) Wrong

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