Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 162 · 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 856 + 454 = 1310 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 67 × 87 = 5829 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 838 + 987 = 1825 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 449 + 409 = 858 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 30 × 59 = 1770 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 643 + 300 = 943 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 77 × 84 = 6468 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 41 × 67 = 2742 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 963 + 732 = 1695 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 206 + 229 = 435 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 19 × 61 = 1159 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 391 + 698 = 1089 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 28 × 72 = 2009 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 360 + 814 = 1174 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 94 × 45 = 4230 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 57 × 60 = 3428 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 33 × 20 = 660 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 43 × 37 = 1586 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 567 + 342 = 917 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 154 + 823 = 980 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 418 + 280 = 703 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 34 × 32 = 1088 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 63 × 95 = 5985 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 54 × 25 = 1350 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 193 + 609 = 799 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 179 + 288 = 467 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 474 + 291 = 765 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 52 × 50 = 2602 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 320 + 573 = 884 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 99 × 54 = 5346 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 937 + 797 = 1734 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 13 × 44 = 572 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 406 + 665 = 1062 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 793 + 605 = 1393 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 652 + 454 = 1100 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 518 + 206 = 724 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 615 + 245 = 863 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 243 + 582 = 825 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 893 + 352 = 1245 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 807 + 844 = 1650 right or wrong? (a) Right (b) Wrong

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