Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 89 · 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 79 × 26 = 2054 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 424 + 187 = 611 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 630 + 553 = 1183 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 712 + 317 = 1029 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 987 + 522 = 1509 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 30 × 44 = 1320 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 595 + 878 = 1473 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 315 + 558 = 875 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 227 + 424 = 643 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 95 × 59 = 5598 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 260 + 658 = 920 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 88 × 31 = 2725 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 32 × 58 = 1854 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 551 + 877 = 1428 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 841 + 944 = 1785 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 19 × 41 = 779 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 938 + 512 = 1450 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 63 × 36 = 2268 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 731 + 381 = 1112 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 36 × 30 = 1080 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 229 + 878 = 1107 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 38 × 93 = 3534 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 181 + 559 = 740 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 83 × 55 = 4557 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 88 × 21 = 1855 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 115 + 337 = 452 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 28 × 88 = 2460 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 432 + 944 = 1370 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 44 × 34 = 1496 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 95 × 50 = 4744 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 756 + 189 = 945 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 45 × 35 = 1575 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 33 × 67 = 2211 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 265 + 403 = 676 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 30 × 59 = 1770 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 96 × 39 = 3744 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 560 + 679 = 1241 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 229 + 904 = 1133 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 974 + 580 = 1546 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 71 × 56 = 3974 right or wrong? (a) Right (b) Wrong

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