Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 382 · 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 26 × 64 = 1657 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 13 × 79 = 1018 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 429 + 437 = 866 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 562 + 456 = 1010 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 826 + 908 = 1734 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 24 × 22 = 528 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 723 + 291 = 1014 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 957 + 175 = 1140 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 12 = 163 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 46 × 90 = 4140 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 860 + 602 = 1462 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 97 = 1552 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 89 × 79 = 7031 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 24 × 15 = 352 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 155 + 497 = 652 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 836 + 642 = 1478 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 323 + 715 = 1038 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 879 + 518 = 1390 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 31 × 78 = 2410 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 311 + 687 = 999 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 826 + 738 = 1567 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 64 × 52 = 3328 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 286 + 381 = 667 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 18 × 27 = 486 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 166 + 843 = 1009 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 958 + 643 = 1601 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 44 × 29 = 1283 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 98 × 33 = 3237 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 707 + 194 = 901 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 27 × 41 = 1107 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 763 + 851 = 1614 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 81 × 73 = 5911 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 163 + 966 = 1129 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 23 × 18 = 417 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 287 + 185 = 466 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 17 × 22 = 374 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 871 + 599 = 1472 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 32 × 19 = 614 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 134 + 817 = 951 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 742 + 478 = 1220 right or wrong? (a) Right (b) Wrong

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