Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 62 · 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 50 × 69 = 3450 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 709 + 539 = 1248 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 531 + 247 = 780 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 682 + 444 = 1125 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 29 × 18 = 520 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 773 + 647 = 1427 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 232 + 904 = 1144 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 26 × 14 = 366 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 50 × 12 = 600 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 188 + 894 = 1079 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 828 + 946 = 1774 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 67 × 12 = 804 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 58 × 32 = 1859 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 697 + 859 = 1560 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 56 × 84 = 4708 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 58 × 50 = 2900 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 89 × 25 = 2228 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 25 × 61 = 1525 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 778 + 447 = 1225 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 53 × 82 = 4344 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 15 × 98 = 1475 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 84 × 81 = 6798 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 84 × 20 = 1680 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 688 + 207 = 893 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 86 × 60 = 5162 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 99 × 91 = 9003 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 18 × 50 = 904 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 91 × 99 = 9009 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 99 × 83 = 8223 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 54 × 93 = 5022 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 41 × 82 = 3362 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 77 × 75 = 5766 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 45 = 1166 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 61 × 66 = 4018 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 85 × 56 = 4766 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 908 + 685 = 1593 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 12 × 49 = 589 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 28 × 95 = 2660 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 717 + 245 = 959 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 41 × 35 = 1435 right or wrong? (a) Right (b) Wrong

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