Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 767 · 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 482 + 241 = 723 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 30 × 28 = 840 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 52 × 96 = 4984 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 49 × 19 = 933 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 319 + 488 = 807 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 759 + 632 = 1396 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 45 × 72 = 3233 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 22 × 67 = 1476 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 989 + 469 = 1449 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 66 × 35 = 2310 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 64 × 58 = 3718 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 875 + 623 = 1498 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 45 × 40 = 1800 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 760 + 724 = 1484 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 650 + 496 = 1147 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 14 × 76 = 1064 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 960 + 498 = 1458 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 208 + 183 = 396 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 237 + 350 = 587 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 839 + 490 = 1329 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 802 + 576 = 1374 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 94 × 89 = 8366 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 599 + 425 = 1024 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 129 + 960 = 1089 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 34 × 83 = 2817 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 15 × 37 = 551 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 52 × 92 = 4783 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 237 + 610 = 848 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 90 × 26 = 2340 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 41 × 35 = 1428 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 748 + 857 = 1609 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 520 + 506 = 1026 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 97 × 83 = 8051 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 12 × 19 = 230 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 60 × 61 = 3660 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 72 × 82 = 5904 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 91 × 78 = 7106 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 16 × 72 = 1154 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 89 × 37 = 3293 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 194 + 825 = 1019 right or wrong? (a) Wrong (b) Right

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