Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 693 · 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 70 × 21 = 1467 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 40 × 89 = 3557 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 702 + 301 = 996 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 585 + 387 = 972 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 18 × 72 = 1295 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 118 + 946 = 1070 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 89 × 42 = 3738 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 968 + 522 = 1490 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 16 × 84 = 1344 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 19 × 77 = 1463 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 88 × 94 = 8272 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 59 × 71 = 4184 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 37 × 46 = 1696 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 77 × 33 = 2541 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 36 × 99 = 3564 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 25 × 83 = 2075 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 35 × 14 = 488 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 18 × 58 = 1044 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 774 + 754 = 1519 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 597 + 601 = 1198 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 24 × 59 = 1418 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 559 + 910 = 1465 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 54 × 24 = 1295 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 14 × 34 = 476 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 933 + 597 = 1539 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 902 + 568 = 1477 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 87 × 30 = 2610 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 62 × 82 = 5093 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 67 × 93 = 6231 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 46 × 87 = 3999 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 973 + 995 = 1964 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 839 + 499 = 1338 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 740 + 891 = 1631 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 837 + 432 = 1269 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 42 × 40 = 1680 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 35 × 77 = 2695 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 79 × 52 = 4108 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 487 + 499 = 992 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 419 + 614 = 1038 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 81 × 76 = 6156 right or wrong? (a) Wrong (b) Right

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