Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 501 · 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 191 + 273 = 459 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 80 × 44 = 3520 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 362 + 171 = 524 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 660 + 782 = 1441 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 217 + 993 = 1217 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 773 + 895 = 1668 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 189 + 987 = 1167 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 24 × 41 = 984 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 61 × 99 = 6039 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 32 × 12 = 386 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 42 × 45 = 1885 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 91 × 66 = 6006 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 46 × 77 = 3542 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 13 × 31 = 403 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 39 × 71 = 2769 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 65 × 22 = 1437 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 94 × 38 = 3576 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 998 + 607 = 1605 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 63 × 18 = 1127 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 70 × 46 = 3220 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 687 + 575 = 1254 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 45 × 22 = 986 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 243 + 378 = 621 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 185 + 219 = 409 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 70 × 79 = 5530 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 98 × 38 = 3724 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 20 × 20 = 400 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 825 + 208 = 1024 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 35 × 81 = 2835 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 490 + 470 = 958 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 186 + 276 = 462 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 774 + 452 = 1226 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 96 × 87 = 8353 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 90 × 57 = 5122 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 634 + 273 = 904 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 75 × 42 = 3150 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 716 + 763 = 1479 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 117 + 486 = 597 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 405 + 747 = 1152 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 65 × 12 = 780 right or wrong? (a) Right (b) Wrong

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