Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 714 · 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 × 54 = 1404 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 21 × 57 = 1202 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 42 × 78 = 3274 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 60 × 46 = 2760 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 73 × 35 = 2555 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 264 + 861 = 1125 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 90 × 12 = 1080 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 108 + 395 = 503 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 74 × 33 = 2442 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 99 × 89 = 8804 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 762 + 173 = 935 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 62 × 15 = 925 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 251 + 466 = 717 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 436 + 266 = 702 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 35 × 35 = 1225 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 91 × 57 = 5187 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 50 = 4750 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 94 × 87 = 8178 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 68 × 50 = 3400 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 45 × 69 = 3105 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 662 + 126 = 788 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 63 × 73 = 4599 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 64 × 17 = 1093 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 31 × 16 = 496 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 14 × 72 = 1006 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 105 + 893 = 998 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 77 × 63 = 4851 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 638 + 935 = 1573 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 864 + 109 = 972 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 98 × 95 = 9310 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 37 × 95 = 3510 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 71 × 55 = 3903 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 57 × 72 = 4098 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 47 × 59 = 2773 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 502 + 356 = 858 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 59 × 71 = 4190 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 41 × 16 = 652 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 23 × 46 = 1059 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 96 × 97 = 9312 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 84 × 46 = 3864 right or wrong? (a) Right (b) Wrong

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