Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 590 · 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 29 × 54 = 1563 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 61 × 80 = 4873 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 74 × 84 = 6216 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 403 + 124 = 527 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 49 × 84 = 4116 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 64 × 47 = 3016 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 79 × 14 = 1101 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 696 + 547 = 1243 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 271 + 776 = 1047 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 38 × 77 = 2918 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 833 + 597 = 1435 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 147 + 878 = 1033 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 61 × 15 = 919 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 34 × 34 = 1160 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 532 + 144 = 667 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 662 + 750 = 1418 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 20 × 41 = 820 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 54 × 36 = 1944 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 756 + 825 = 1581 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 95 × 33 = 3139 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 35 × 93 = 3247 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 96 × 81 = 7776 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 24 × 55 = 1320 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 95 × 54 = 5130 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 99 × 90 = 8908 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 89 × 80 = 7119 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 361 + 107 = 467 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 557 + 902 = 1459 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 23 × 18 = 414 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 714 + 173 = 881 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 74 × 16 = 1184 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 61 × 57 = 3477 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 271 + 253 = 524 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 46 × 35 = 1612 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 25 × 51 = 1275 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 22 × 24 = 528 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 191 + 144 = 335 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 158 + 205 = 363 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 25 × 64 = 1597 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 971 + 862 = 1832 right or wrong? (a) Wrong (b) Right

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