Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 947 · 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 46 × 61 = 2806 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 144 + 483 = 627 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 271 + 421 = 687 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 31 = 1082 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 15 × 70 = 1055 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 27 × 25 = 675 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 344 + 724 = 1068 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 57 × 51 = 2915 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 36 × 22 = 792 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 509 + 649 = 1152 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 70 × 45 = 3156 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 607 + 135 = 746 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 766 + 246 = 1012 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 83 × 25 = 2084 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 511 + 575 = 1083 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 16 × 56 = 901 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 99 × 17 = 1692 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 181 + 915 = 1088 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 307 + 652 = 958 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 70 × 17 = 1181 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 732 + 876 = 1608 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 94 × 88 = 8272 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 85 × 34 = 2890 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 53 × 35 = 1855 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 649 + 838 = 1480 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 64 × 22 = 1405 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 892 + 287 = 1179 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 58 × 53 = 3065 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 83 × 77 = 6391 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 63 × 55 = 3468 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 551 + 769 = 1320 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 512 + 260 = 772 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 731 + 834 = 1565 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 677 + 697 = 1375 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 537 + 365 = 902 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 62 × 81 = 5017 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 326 + 795 = 1121 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 866 + 714 = 1580 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 26 × 70 = 1822 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 32 × 67 = 2144 right or wrong? (a) Wrong (b) Right

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