Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 868 · 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 28 × 24 = 669 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 38 × 17 = 643 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 737 + 405 = 1142 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 33 × 23 = 759 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 219 + 829 = 1045 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 957 + 714 = 1676 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 105 + 478 = 575 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 643 + 636 = 1279 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 95 × 73 = 6942 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 18 × 32 = 576 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 819 + 869 = 1688 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 555 + 929 = 1478 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 411 + 112 = 523 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 61 × 83 = 5060 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 32 × 70 = 2231 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 161 + 121 = 282 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 59 × 58 = 3416 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 43 × 85 = 3655 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 32 × 82 = 2624 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 71 × 16 = 1131 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 426 + 198 = 624 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 56 × 77 = 4312 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 90 × 14 = 1260 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 37 × 55 = 2035 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 93 × 52 = 4836 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 290 + 986 = 1268 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 598 + 575 = 1171 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 43 × 70 = 3007 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 16 × 63 = 1008 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 15 × 43 = 644 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 16 × 84 = 1337 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 676 + 467 = 1152 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 939 + 156 = 1101 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 70 × 81 = 5670 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 23 × 68 = 1564 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 421 + 749 = 1170 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 21 × 21 = 441 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 962 + 320 = 1282 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 40 × 88 = 3520 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 91 × 21 = 1906 right or wrong? (a) Right (b) Wrong

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