Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 595 · 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 44 × 68 = 2996 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 20 × 13 = 260 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 922 + 143 = 1062 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 85 × 25 = 2125 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 616 + 746 = 1362 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 632 + 150 = 781 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 19 × 33 = 627 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 32 × 19 = 614 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 33 × 32 = 1056 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 716 + 280 = 998 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 59 × 98 = 5782 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 74 × 48 = 3552 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 525 + 125 = 658 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 196 + 182 = 380 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 330 + 847 = 1184 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 885 + 889 = 1774 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 60 × 25 = 1497 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 20 × 18 = 355 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 166 + 449 = 609 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 846 + 860 = 1706 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 824 + 403 = 1226 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 512 + 715 = 1228 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 566 + 136 = 702 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 21 × 21 = 443 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 12 × 41 = 492 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 84 × 66 = 5545 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 134 + 447 = 576 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 968 + 582 = 1550 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 672 + 787 = 1462 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 59 × 29 = 1713 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 131 + 664 = 795 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 400 + 836 = 1236 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 73 × 28 = 2041 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 26 × 40 = 1031 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 862 + 123 = 987 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 443 + 338 = 783 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 82 × 99 = 8118 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 36 × 72 = 2592 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 939 + 519 = 1458 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 423 + 810 = 1236 right or wrong? (a) Wrong (b) Right

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