Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 502 · 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 73 × 52 = 3804 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 81 × 85 = 6885 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 260 + 326 = 586 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 71 × 22 = 1565 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 14 × 33 = 462 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 36 × 80 = 2880 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 620 + 608 = 1224 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 246 + 784 = 1030 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 62 × 33 = 2050 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 381 + 676 = 1051 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 307 + 356 = 654 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 93 × 94 = 8742 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 360 + 565 = 925 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 741 + 722 = 1463 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 59 × 59 = 3489 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 78 × 18 = 1404 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 38 × 53 = 2019 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 67 × 17 = 1139 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 672 + 231 = 903 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 28 × 63 = 1758 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 89 × 39 = 3463 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 268 + 564 = 832 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 32 × 52 = 1656 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 48 × 42 = 2018 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 704 + 252 = 956 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 883 + 734 = 1610 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 41 × 21 = 861 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 92 × 58 = 5336 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 68 × 60 = 4072 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 32 × 51 = 1632 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 12 × 17 = 202 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 89 × 78 = 6942 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 829 + 576 = 1405 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 15 × 12 = 173 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 73 × 29 = 2117 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 96 × 72 = 6912 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 223 + 192 = 415 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 73 = 876 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 58 × 13 = 748 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 450 + 627 = 1077 right or wrong? (a) Right (b) Wrong

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