Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 108 · 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 21 × 87 = 1827 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 45 × 50 = 2257 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 723 + 340 = 1063 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 25 × 21 = 525 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 394 + 981 = 1375 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 88 × 87 = 7661 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 660 + 668 = 1333 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 51 × 73 = 3719 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 89 × 42 = 3738 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 857 + 548 = 1408 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 254 + 404 = 658 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 51 × 82 = 4182 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 605 + 646 = 1246 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 46 × 35 = 1610 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 242 + 965 = 1209 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 472 + 985 = 1457 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 154 + 453 = 607 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 202 + 187 = 389 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 289 + 818 = 1107 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 98 × 25 = 2449 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 486 + 821 = 1307 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 41 × 32 = 1312 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 441 + 551 = 992 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 696 + 455 = 1157 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 16 × 53 = 847 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 180 + 946 = 1124 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 94 × 54 = 5069 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 50 × 66 = 3291 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 21 × 96 = 2016 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 91 × 96 = 8736 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 14 × 45 = 630 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 40 × 46 = 1840 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 21 × 71 = 1488 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 212 + 882 = 1094 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 67 × 93 = 6231 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 73 × 84 = 6136 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 232 + 396 = 625 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 75 × 84 = 6309 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 32 × 54 = 1728 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 404 + 495 = 904 right or wrong? (a) Right (b) Wrong

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