Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 796 · 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 83 × 21 = 1743 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 402 + 684 = 1086 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 173 + 963 = 1136 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 759 + 298 = 1053 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 38 × 98 = 3724 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 535 + 130 = 663 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 478 + 417 = 893 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 50 × 49 = 2447 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 72 × 14 = 1000 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 704 + 386 = 1090 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 308 + 914 = 1222 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 40 × 36 = 1439 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 62 × 68 = 4225 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 892 + 226 = 1120 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 273 + 392 = 672 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 305 + 636 = 941 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 99 × 81 = 8011 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 761 + 880 = 1649 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 723 + 508 = 1233 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 109 + 615 = 716 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 33 × 28 = 926 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 94 × 46 = 4327 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 13 = 166 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 84 × 73 = 6123 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 632 + 745 = 1378 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 37 × 34 = 1265 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 81 × 64 = 5186 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 85 × 21 = 1794 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 632 + 227 = 852 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 298 + 133 = 431 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 115 + 770 = 889 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 729 + 412 = 1140 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 686 + 266 = 959 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 434 + 895 = 1326 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 70 × 35 = 2450 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 621 + 880 = 1501 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 556 + 738 = 1300 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 53 × 85 = 4505 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 571 + 490 = 1062 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 96 × 41 = 3927 right or wrong? (a) Right (b) Wrong

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