Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 741 · 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 177 + 467 = 644 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 78 × 71 = 5547 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 18 × 29 = 524 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 654 + 391 = 1036 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 935 + 490 = 1425 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 441 + 971 = 1412 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 73 = 1525 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 90 × 76 = 6845 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 18 × 14 = 252 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 751 + 211 = 961 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 31 × 29 = 899 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 79 × 50 = 3950 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 68 × 12 = 809 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 502 + 864 = 1366 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 55 × 62 = 3410 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 93 × 38 = 3534 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 58 = 5684 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 53 × 14 = 744 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 689 + 942 = 1636 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 14 × 39 = 542 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 271 + 444 = 715 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 39 × 87 = 3393 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 206 + 262 = 468 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 38 × 43 = 1634 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 99 × 41 = 4056 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 393 + 134 = 527 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 51 × 70 = 3574 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 59 × 48 = 2830 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 481 + 658 = 1139 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 775 + 912 = 1695 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 671 + 647 = 1318 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 53 × 39 = 2067 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 59 = 1770 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 276 + 508 = 784 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 40 × 39 = 1560 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 23 × 42 = 957 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 75 = 2474 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 35 × 17 = 595 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 91 × 81 = 7371 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 74 × 73 = 5402 right or wrong? (a) Wrong (b) Right

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