Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 416 · 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 43 × 45 = 1935 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 333 + 342 = 675 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 58 × 90 = 5220 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 96 × 37 = 3559 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 47 × 27 = 1276 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 622 + 216 = 830 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 439 + 755 = 1193 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 654 + 312 = 968 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 25 × 50 = 1250 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 15 × 64 = 960 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 45 × 24 = 1080 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 93 × 81 = 7533 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 99 × 44 = 4351 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 245 + 672 = 921 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 61 × 39 = 2381 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 605 + 205 = 810 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 759 + 226 = 991 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 66 × 41 = 2706 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 96 × 53 = 5093 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 12 × 79 = 948 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 56 × 87 = 4871 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 89 × 42 = 3738 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 41 × 28 = 1148 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 22 × 74 = 1628 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 618 + 765 = 1385 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 77 × 52 = 4004 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 880 + 851 = 1731 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 521 + 872 = 1394 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 88 × 42 = 3696 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 551 + 415 = 973 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 315 + 774 = 1089 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 317 + 320 = 640 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 59 × 71 = 4189 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 82 × 35 = 2878 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 38 × 56 = 2131 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 48 × 28 = 1353 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 245 + 286 = 539 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 49 × 22 = 1078 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 124 + 706 = 830 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 40 × 14 = 560 right or wrong? (a) Wrong (b) Right

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