Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 42 · 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 17 × 31 = 527 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 81 × 21 = 1701 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 27 × 84 = 2261 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 33 × 28 = 915 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 726 + 471 = 1197 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 13 × 26 = 335 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 44 × 28 = 1232 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 229 + 414 = 637 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 97 × 94 = 9122 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 72 × 79 = 5682 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 83 × 32 = 2657 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 467 + 453 = 918 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 57 × 96 = 5472 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 378 + 995 = 1376 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 658 + 262 = 920 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 69 × 63 = 4347 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 34 × 39 = 1326 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 96 × 14 = 1344 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 93 × 98 = 9106 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 89 × 32 = 2848 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 333 + 467 = 796 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 26 × 85 = 2206 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 124 + 491 = 615 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 76 × 87 = 6612 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 57 × 72 = 4105 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 452 + 150 = 594 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 20 × 67 = 1346 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 15 × 28 = 418 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 84 × 95 = 7975 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 23 × 27 = 615 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 363 + 656 = 1019 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 87 × 62 = 5394 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 454 + 932 = 1386 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 16 × 98 = 1568 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 48 × 22 = 1061 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 996 + 310 = 1313 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 584 + 944 = 1528 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 274 + 866 = 1136 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 82 × 98 = 8036 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 94 × 13 = 1222 right or wrong? (a) Right (b) Wrong

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