Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 582 · 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 68 × 88 = 5985 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 56 × 44 = 2464 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 733 + 729 = 1462 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 60 × 19 = 1140 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 64 × 16 = 1024 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 46 × 82 = 3772 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 105 + 178 = 283 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 60 × 35 = 2094 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 53 × 48 = 2544 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 38 × 64 = 2432 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 34 × 61 = 2074 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 304 + 852 = 1156 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 839 + 314 = 1156 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 26 × 54 = 1396 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 24 × 67 = 1608 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 393 + 480 = 872 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 62 × 29 = 1799 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 460 + 125 = 582 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 334 + 840 = 1179 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 267 + 600 = 867 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 15 × 71 = 1065 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 985 + 441 = 1435 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 86 × 43 = 3698 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 934 + 872 = 1806 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 945 + 953 = 1898 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 62 × 37 = 2298 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 156 + 183 = 337 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 452 + 385 = 837 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 166 + 726 = 892 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 86 × 28 = 2408 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 896 + 820 = 1716 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 385 + 364 = 749 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 81 × 95 = 7704 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 27 × 21 = 566 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 140 + 251 = 395 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 35 × 23 = 805 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 34 × 94 = 3199 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 18 × 78 = 1398 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 486 + 971 = 1465 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 36 × 81 = 2916 right or wrong? (a) Right (b) Wrong

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