Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 687 · 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 39 × 26 = 1014 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 18 × 66 = 1189 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 148 + 715 = 863 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 180 + 179 = 356 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 175 + 241 = 416 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 39 × 39 = 1523 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 31 × 41 = 1264 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 86 = 1204 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 13 × 17 = 212 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 205 + 683 = 888 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 31 × 28 = 860 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 52 × 79 = 4108 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 99 × 69 = 6831 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 32 × 21 = 665 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 86 × 91 = 7826 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 40 × 18 = 720 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 739 + 499 = 1242 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 70 × 97 = 6790 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 738 + 932 = 1676 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 60 × 77 = 4621 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 460 + 475 = 938 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 791 + 664 = 1455 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 27 × 28 = 750 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 17 × 29 = 493 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 837 + 113 = 958 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 485 + 620 = 1106 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 36 × 22 = 792 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 315 + 625 = 940 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 71 × 30 = 2126 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 44 × 75 = 3300 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 32 × 33 = 1060 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 724 + 582 = 1305 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 23 × 40 = 922 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 45 × 20 = 895 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 613 + 676 = 1289 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 48 × 87 = 4176 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 58 × 91 = 5281 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 228 + 896 = 1124 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 959 + 179 = 1146 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 960 + 198 = 1158 right or wrong? (a) Wrong (b) Right

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