Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 464 · 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 66 × 20 = 1320 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 42 × 35 = 1470 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 97 × 62 = 6007 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 116 + 418 = 534 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 37 × 69 = 2551 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 355 + 455 = 810 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 56 × 30 = 1685 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 71 = 1775 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 24 × 31 = 749 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 81 × 46 = 3726 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 76 × 65 = 4940 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 56 × 42 = 2351 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 564 + 256 = 820 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 28 × 33 = 924 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 576 + 506 = 1082 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 58 × 96 = 5569 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 742 + 719 = 1457 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 58 × 69 = 4002 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 801 + 630 = 1431 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 70 × 53 = 3712 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 683 + 277 = 960 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 95 × 89 = 8454 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 96 × 14 = 1344 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 908 + 748 = 1651 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 729 + 568 = 1295 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 640 + 736 = 1373 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 814 + 329 = 1143 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 107 + 511 = 626 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 830 + 910 = 1740 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 14 × 19 = 260 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 39 × 35 = 1360 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 522 + 400 = 922 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 121 + 222 = 335 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 98 × 47 = 4606 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 267 + 213 = 480 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 25 × 51 = 1274 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 62 × 81 = 5031 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 27 × 16 = 438 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 537 + 247 = 790 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 990 + 850 = 1840 right or wrong? (a) Wrong (b) Right

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