Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 998 · 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 27 × 93 = 2509 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 29 × 54 = 1566 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 706 + 987 = 1701 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 70 × 98 = 6860 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 39 × 34 = 1335 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 33 × 19 = 619 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 264 + 894 = 1158 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 33 × 12 = 396 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 61 × 76 = 4636 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 802 + 370 = 1172 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 271 + 834 = 1105 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 727 + 652 = 1387 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 55 × 18 = 990 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 65 × 85 = 5532 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 94 × 43 = 4045 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 98 × 25 = 2450 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 53 × 24 = 1279 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 94 × 12 = 1126 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 550 + 180 = 722 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 54 × 31 = 1674 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 482 + 597 = 1080 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 89 × 15 = 1330 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 26 × 42 = 1092 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 26 × 32 = 832 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 698 + 299 = 998 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 90 × 12 = 1082 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 698 + 240 = 938 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 21 × 84 = 1764 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 69 × 76 = 5244 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 522 + 966 = 1494 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 255 + 610 = 864 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 96 × 13 = 1248 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 33 × 43 = 1419 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 436 + 407 = 843 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 30 = 2632 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 238 + 433 = 671 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 98 × 71 = 6960 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 252 + 933 = 1178 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 381 + 405 = 786 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 83 × 66 = 5474 right or wrong? (a) Right (b) Wrong

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