Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 773 · 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 146 + 952 = 1101 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 167 + 505 = 672 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 37 × 86 = 3184 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 57 × 49 = 2793 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 78 × 75 = 5844 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 21 × 69 = 1456 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 72 × 86 = 6192 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 34 × 65 = 2210 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 901 + 429 = 1322 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 38 × 95 = 3610 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 64 × 77 = 4924 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 418 + 424 = 842 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 204 + 811 = 1008 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 71 × 78 = 5536 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 78 × 18 = 1406 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 76 × 82 = 6232 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 30 × 48 = 1440 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 78 × 28 = 2183 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 690 + 146 = 836 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 93 × 78 = 7251 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 64 × 88 = 5632 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 18 × 68 = 1231 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 78 × 75 = 5848 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 18 × 12 = 216 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 63 × 61 = 3843 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 305 + 991 = 1291 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 86 × 86 = 7396 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 28 × 21 = 588 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 85 × 32 = 2720 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 18 × 16 = 289 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 445 + 348 = 793 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 66 × 57 = 3754 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 45 × 87 = 3915 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 690 + 547 = 1237 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 912 + 727 = 1635 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 685 + 595 = 1289 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 13 × 37 = 483 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 679 + 313 = 985 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 842 + 882 = 1733 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 539 + 863 = 1402 right or wrong? (a) Right (b) Wrong

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