Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 466 · 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 209 + 970 = 1173 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 12 × 83 = 992 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 459 + 532 = 999 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 458 + 419 = 868 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 19 × 16 = 304 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 527 + 713 = 1240 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 96 × 49 = 4704 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 651 + 258 = 917 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 894 + 393 = 1285 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 56 × 31 = 1730 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 37 × 72 = 2664 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 53 × 78 = 4142 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 24 × 33 = 789 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 40 × 93 = 3720 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 70 × 12 = 837 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 75 × 91 = 6830 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 168 + 602 = 775 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 38 × 29 = 1099 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 83 × 57 = 4731 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 81 × 31 = 2506 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 933 + 902 = 1826 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 51 × 23 = 1173 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 310 + 549 = 859 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 69 × 29 = 2001 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 33 × 78 = 2582 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 37 × 84 = 3113 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 85 × 64 = 5440 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 432 + 386 = 824 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 165 + 409 = 581 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 19 × 59 = 1121 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 157 + 804 = 961 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 351 + 831 = 1180 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 20 × 51 = 1020 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 370 + 488 = 852 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 74 × 24 = 1774 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 16 × 31 = 496 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 675 + 530 = 1207 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 432 + 646 = 1083 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 90 × 72 = 6480 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 96 × 37 = 3552 right or wrong? (a) Right (b) Wrong

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