Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 357 · 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 37 × 85 = 3145 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 156 + 404 = 560 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 453 + 202 = 655 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 61 × 16 = 979 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 752 + 379 = 1131 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 700 + 478 = 1178 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 884 + 999 = 1882 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 767 + 519 = 1280 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 996 + 815 = 1811 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 419 + 895 = 1314 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 44 × 14 = 617 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 97 × 21 = 2037 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 90 × 89 = 8010 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 45 × 43 = 1935 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 29 × 15 = 441 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 17 × 54 = 918 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 63 = 3024 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 46 × 94 = 4324 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 22 × 99 = 2180 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 419 + 581 = 992 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 55 × 17 = 935 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 263 + 330 = 585 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 24 × 84 = 2023 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 873 + 810 = 1683 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 12 × 16 = 192 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 81 × 66 = 5349 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 212 + 293 = 502 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 34 × 33 = 1122 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 685 + 342 = 1034 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 43 × 88 = 3785 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 542 + 149 = 683 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 672 + 689 = 1361 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 64 × 46 = 2943 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 762 + 109 = 877 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 348 + 884 = 1241 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 13 × 85 = 1107 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 321 + 237 = 558 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 86 × 34 = 2933 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 58 × 76 = 4407 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 12 × 54 = 643 right or wrong? (a) Right (b) Wrong

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