Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 964 · 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 872 + 491 = 1363 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 93 × 55 = 5114 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 21 × 18 = 378 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 62 × 60 = 3720 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 68 × 66 = 4496 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 22 × 18 = 396 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 89 × 83 = 7387 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 70 × 45 = 3149 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 512 + 119 = 625 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 13 × 43 = 568 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 739 + 779 = 1518 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 80 × 81 = 6483 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 47 × 87 = 4089 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 12 × 17 = 207 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 766 + 223 = 989 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 71 × 20 = 1419 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 96 = 4609 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 87 × 33 = 2871 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 756 + 466 = 1222 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 285 + 234 = 520 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 704 + 674 = 1375 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 232 + 159 = 398 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 22 × 63 = 1382 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 76 × 38 = 2888 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 274 + 167 = 432 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 95 × 28 = 2657 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 19 × 68 = 1292 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 364 + 951 = 1312 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 73 × 34 = 2487 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 24 × 23 = 552 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 71 × 71 = 5034 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 87 × 47 = 4089 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 44 × 54 = 2376 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 840 + 234 = 1073 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 556 + 789 = 1345 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 45 × 60 = 2703 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 132 + 588 = 715 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 80 × 41 = 3279 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 77 = 1694 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 89 × 99 = 8811 right or wrong? (a) Wrong (b) Right

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