Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 732 · 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 74 × 18 = 1332 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 36 × 85 = 3060 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 69 × 12 = 828 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 365 + 595 = 960 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 50 × 61 = 3050 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 284 + 898 = 1185 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 92 × 96 = 8832 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 65 × 79 = 5135 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 99 × 37 = 3657 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 79 × 32 = 2528 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 333 + 676 = 1010 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 693 + 769 = 1471 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 35 × 42 = 1479 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 344 + 697 = 1049 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 22 × 30 = 660 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 49 × 38 = 1862 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 872 + 519 = 1390 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 22 × 41 = 900 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 315 + 298 = 620 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 25 × 23 = 575 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 974 + 629 = 1603 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 870 + 650 = 1520 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 67 × 25 = 1675 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 528 + 170 = 703 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 45 × 14 = 634 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 496 + 314 = 816 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 254 + 504 = 760 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 377 + 286 = 658 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 74 × 21 = 1552 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 435 + 484 = 919 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 68 × 19 = 1291 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 57 × 64 = 3648 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 200 + 805 = 1005 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 778 + 933 = 1711 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 733 + 814 = 1547 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 748 + 956 = 1704 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 94 × 15 = 1409 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 50 = 1400 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 710 + 541 = 1251 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 94 × 58 = 5458 right or wrong? (a) Right (b) Wrong

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