Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 68 · 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 + 876 = 1017 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 53 × 86 = 4558 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 852 + 368 = 1220 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 969 + 505 = 1474 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 14 × 66 = 924 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 84 × 65 = 5460 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 982 + 480 = 1462 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 139 + 455 = 598 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 58 × 20 = 1160 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 45 × 60 = 2698 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 32 × 93 = 2978 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 336 + 347 = 689 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 99 × 25 = 2476 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 623 + 550 = 1182 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 96 × 28 = 2690 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 94 × 78 = 7332 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 162 + 500 = 662 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 86 × 86 = 7404 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 723 + 185 = 910 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 17 × 13 = 221 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 177 + 611 = 788 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 76 × 32 = 2436 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 17 × 20 = 335 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 274 + 773 = 1047 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 19 × 13 = 247 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 89 × 74 = 6583 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 22 × 92 = 2016 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 15 × 90 = 1341 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 62 × 71 = 4409 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 829 + 833 = 1654 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 324 + 203 = 527 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 86 × 49 = 4214 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 923 + 914 = 1837 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 33 × 64 = 2112 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 471 + 544 = 1024 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 631 + 665 = 1296 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 133 + 672 = 805 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 389 + 239 = 628 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 25 × 80 = 2000 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 48 × 26 = 1249 right or wrong? (a) Wrong (b) Right

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