Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 106 · 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 141 + 466 = 607 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 82 × 90 = 7383 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 624 + 268 = 899 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 49 × 79 = 3877 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 30 × 34 = 1020 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 97 × 12 = 1163 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 180 + 742 = 922 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 37 × 99 = 3663 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 308 + 266 = 574 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 81 × 25 = 2025 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 323 + 214 = 539 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 28 × 57 = 1596 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 19 × 73 = 1384 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 99 × 74 = 7320 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 267 + 348 = 616 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 259 + 515 = 765 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 351 + 146 = 501 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 530 + 587 = 1117 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 42 × 22 = 924 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 903 + 170 = 1073 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 34 × 17 = 571 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 980 + 231 = 1211 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 97 × 43 = 4171 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 46 × 95 = 4369 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 67 × 91 = 6088 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 933 + 162 = 1087 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 33 × 37 = 1221 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 15 × 78 = 1167 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 51 × 25 = 1275 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 56 × 15 = 840 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 94 × 75 = 7050 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 516 + 977 = 1493 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 509 + 660 = 1169 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 927 + 353 = 1280 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 84 × 25 = 2108 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 761 + 757 = 1518 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 70 × 60 = 4200 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 74 × 17 = 1258 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 958 + 942 = 1894 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 507 + 989 = 1496 right or wrong? (a) Wrong (b) Right

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