Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 811 · 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 × 52 = 3536 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 161 + 579 = 740 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 566 + 216 = 782 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 277 + 658 = 935 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 508 + 888 = 1396 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 87 × 53 = 4604 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 891 + 961 = 1858 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 35 × 72 = 2520 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 29 × 24 = 687 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 325 + 726 = 1051 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 441 + 601 = 1039 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 42 × 91 = 3815 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 31 × 60 = 1854 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 455 + 803 = 1258 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 259 + 135 = 398 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 25 × 21 = 525 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 643 + 546 = 1185 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 121 + 431 = 552 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 674 + 799 = 1473 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 426 + 980 = 1406 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 731 + 437 = 1170 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 32 × 85 = 2718 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 247 + 461 = 708 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 405 + 461 = 866 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 18 × 66 = 1188 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 165 + 902 = 1067 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 31 × 69 = 2139 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 992 + 537 = 1529 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 529 + 849 = 1387 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 322 + 431 = 757 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 702 + 513 = 1215 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 71 × 78 = 5538 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 47 × 24 = 1121 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 33 × 95 = 3135 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 720 + 642 = 1362 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 26 × 43 = 1118 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 96 × 80 = 7681 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 54 × 39 = 2113 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 98 × 25 = 2450 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 89 × 83 = 7387 right or wrong? (a) Wrong (b) Right

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