Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 269 · 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 75 × 25 = 1873 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 45 × 89 = 4005 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 280 + 621 = 898 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 46 × 83 = 3818 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 901 + 769 = 1670 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 84 × 84 = 7056 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 738 + 306 = 1045 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 51 × 76 = 3876 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 663 + 748 = 1405 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 90 × 70 = 6299 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 547 + 539 = 1086 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 684 + 973 = 1654 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 80 × 61 = 4880 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 445 + 845 = 1289 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 84 × 23 = 1932 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 619 + 868 = 1489 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 55 × 36 = 1980 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 24 × 21 = 504 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 40 × 45 = 1801 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 73 × 44 = 3212 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 81 × 61 = 4942 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 56 × 80 = 4482 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 78 × 40 = 3120 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 17 × 77 = 1309 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 433 + 680 = 1113 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 89 × 44 = 3916 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 779 + 719 = 1504 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 196 + 866 = 1059 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 42 × 28 = 1176 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 78 × 67 = 5226 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 48 × 24 = 1152 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 450 + 647 = 1097 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 663 + 165 = 828 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 305 + 228 = 531 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 276 + 472 = 741 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 59 × 36 = 2125 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 631 + 474 = 1105 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 350 + 906 = 1256 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 54 × 77 = 4158 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 50 × 36 = 1794 right or wrong? (a) Right (b) Wrong

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