Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 63 · 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 24 × 72 = 1734 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 723 + 122 = 838 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 59 × 22 = 1298 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 16 × 25 = 400 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 98 × 88 = 8624 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 81 × 64 = 5184 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 450 + 924 = 1370 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 28 × 94 = 2641 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 33 × 20 = 660 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 179 + 997 = 1179 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 153 + 289 = 449 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 386 + 540 = 927 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 80 × 22 = 1760 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 59 × 79 = 4670 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 84 × 89 = 7476 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 33 × 52 = 1725 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 221 + 803 = 1022 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 169 + 412 = 580 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 447 + 191 = 638 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 526 + 743 = 1269 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 777 + 370 = 1147 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 56 × 45 = 2520 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 49 × 74 = 3626 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 83 × 71 = 5893 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 649 + 390 = 1046 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 46 × 95 = 4370 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 599 + 193 = 792 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 32 × 76 = 2432 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 886 + 340 = 1231 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 13 × 71 = 917 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 50 × 81 = 4057 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 19 × 22 = 424 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 190 + 894 = 1084 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 28 × 75 = 2093 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 80 × 76 = 6089 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 122 + 605 = 725 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 24 × 35 = 840 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 451 + 286 = 737 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 84 = 2436 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 50 × 24 = 1200 right or wrong? (a) Right (b) Wrong

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