Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 493 · 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 696 + 837 = 1532 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 529 + 630 = 1159 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 20 × 23 = 460 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 89 × 75 = 6671 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 65 × 51 = 3309 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 96 × 98 = 9408 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 43 × 27 = 1161 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 29 × 31 = 893 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 574 + 917 = 1491 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 651 + 238 = 891 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 12 × 67 = 804 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 94 × 56 = 5270 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 94 × 70 = 6580 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 682 + 147 = 829 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 163 + 318 = 479 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 146 + 155 = 297 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 250 + 922 = 1171 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 92 × 27 = 2484 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 76 × 34 = 2584 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 687 + 167 = 849 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 75 × 68 = 5100 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 299 + 262 = 561 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 765 + 169 = 938 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 72 × 34 = 2448 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 475 + 124 = 599 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 271 + 274 = 542 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 99 × 52 = 5155 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 45 × 66 = 2970 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 402 + 165 = 563 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 264 + 851 = 1115 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 91 × 94 = 8554 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 26 × 56 = 1447 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 12 × 23 = 268 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 45 × 24 = 1080 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 411 + 300 = 702 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 42 × 78 = 3285 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 903 + 997 = 1905 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 90 × 89 = 8003 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 991 + 256 = 1247 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 29 × 20 = 588 right or wrong? (a) Wrong (b) Right

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