Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 717 · 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 60 × 39 = 2339 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 62 × 54 = 3348 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 468 + 594 = 1063 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 57 × 91 = 5187 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 131 + 531 = 662 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 33 × 21 = 690 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 40 × 58 = 2320 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 159 + 855 = 1014 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 920 + 562 = 1482 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 55 × 64 = 3515 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 19 × 29 = 543 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 55 × 45 = 2474 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 828 + 856 = 1692 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 21 × 13 = 280 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 79 × 92 = 7269 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 28 × 34 = 952 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 13 × 41 = 533 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 686 + 985 = 1664 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 494 + 173 = 667 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 37 × 29 = 1073 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 91 × 75 = 6825 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 39 × 51 = 1995 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 66 × 37 = 2442 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 87 × 62 = 5394 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 715 + 568 = 1282 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 95 × 88 = 8360 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 89 × 42 = 3745 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 957 + 834 = 1791 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 515 + 122 = 637 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 75 × 70 = 5250 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 224 + 219 = 443 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 598 + 698 = 1301 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 760 + 518 = 1272 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 34 × 22 = 748 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 795 + 920 = 1715 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 774 + 724 = 1503 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 470 + 924 = 1395 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 348 + 893 = 1241 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 54 × 94 = 5072 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 73 × 55 = 4020 right or wrong? (a) Right (b) Wrong

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