Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 18 · 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 828 + 122 = 950 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 55 × 62 = 3404 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 456 + 127 = 583 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 240 + 528 = 768 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 51 × 12 = 612 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 400 + 144 = 544 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 332 + 641 = 973 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 40 × 89 = 3560 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 86 × 67 = 5762 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 21 × 20 = 420 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 82 × 71 = 5822 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 47 × 69 = 3245 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 93 × 82 = 7626 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 351 + 527 = 878 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 93 × 28 = 2604 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 162 + 269 = 432 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 16 × 66 = 1059 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 134 + 523 = 659 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 789 + 114 = 903 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 121 + 439 = 560 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 29 × 30 = 875 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 54 × 39 = 2106 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 32 × 91 = 2912 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 392 + 568 = 955 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 256 + 702 = 956 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 126 + 163 = 289 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 66 × 25 = 1644 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 622 + 438 = 1060 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 20 × 80 = 1600 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 14 × 60 = 840 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 565 + 139 = 704 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 80 × 72 = 5760 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 49 × 39 = 1911 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 34 × 28 = 956 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 164 + 814 = 978 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 94 × 77 = 7238 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 49 × 19 = 924 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 40 × 76 = 3040 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 277 + 584 = 866 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 436 + 521 = 957 right or wrong? (a) Right (b) Wrong

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