Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 993 · 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 72 × 28 = 2023 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 701 + 711 = 1412 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 41 × 14 = 582 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 621 + 186 = 807 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 992 + 230 = 1222 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 59 × 71 = 4189 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 71 × 35 = 2485 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 24 × 34 = 816 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 37 × 81 = 2997 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 84 × 81 = 6800 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 74 × 87 = 6438 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 149 + 945 = 1094 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 746 + 224 = 970 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 218 + 263 = 481 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 893 + 543 = 1436 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 85 × 28 = 2380 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 522 + 264 = 786 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 98 × 56 = 5488 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 12 × 81 = 970 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 73 × 99 = 7235 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 73 × 81 = 5904 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 18 × 33 = 594 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 80 × 90 = 7200 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 73 × 56 = 4095 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 73 × 76 = 5539 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 762 + 400 = 1163 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 77 × 23 = 1771 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 77 × 84 = 6468 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 67 × 77 = 5159 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 89 × 91 = 8099 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 526 + 164 = 690 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 809 + 958 = 1773 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 61 × 27 = 1644 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 72 × 97 = 6984 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 72 = 6336 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 28 × 58 = 1624 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 99 × 33 = 3258 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 81 × 26 = 2108 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 441 + 571 = 1012 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 179 + 346 = 522 right or wrong? (a) Right (b) Wrong

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