Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 17 · 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 82 × 86 = 7052 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 95 × 96 = 9120 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 21 × 71 = 1490 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 79 × 83 = 6557 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 887 + 358 = 1245 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 18 × 23 = 411 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 170 + 318 = 494 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 65 × 30 = 1957 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 562 + 723 = 1285 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 75 × 35 = 2625 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 66 × 82 = 5418 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 74 × 61 = 4516 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 58 × 83 = 4814 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 62 × 17 = 1054 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 867 + 472 = 1339 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 408 + 961 = 1369 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 89 × 32 = 2848 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 24 × 74 = 1783 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 27 × 60 = 1620 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 882 + 524 = 1406 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 348 + 805 = 1149 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 34 × 82 = 2788 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 28 × 21 = 582 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 12 × 13 = 156 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 60 × 99 = 5940 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 934 + 767 = 1701 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 547 + 894 = 1441 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 350 + 537 = 887 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 25 × 45 = 1116 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 313 + 162 = 475 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 190 + 741 = 927 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 133 + 790 = 923 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 258 + 160 = 418 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 602 + 920 = 1522 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 67 × 66 = 4421 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 71 × 23 = 1635 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 931 + 524 = 1455 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 605 + 388 = 991 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 57 × 25 = 1425 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 643 + 701 = 1340 right or wrong? (a) Right (b) Wrong

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