Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 75 · 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 399 + 123 = 522 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 74 × 91 = 6734 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 631 + 904 = 1535 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 363 + 833 = 1196 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 92 × 61 = 5612 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 87 × 76 = 6612 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 48 × 30 = 1440 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 62 × 18 = 1116 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 79 × 75 = 5934 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 58 × 49 = 2844 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 349 + 727 = 1076 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 76 × 88 = 6688 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 597 + 992 = 1584 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 657 + 463 = 1120 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 46 × 40 = 1840 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 12 × 20 = 241 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 271 + 634 = 899 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 548 + 833 = 1377 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 79 × 34 = 2692 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 37 × 18 = 665 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 75 × 91 = 6825 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 124 + 817 = 941 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 730 + 231 = 961 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 917 + 220 = 1137 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 975 + 777 = 1752 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 564 + 727 = 1289 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 744 + 568 = 1311 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 156 + 858 = 1014 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 32 × 53 = 1696 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 79 × 52 = 4108 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 36 × 36 = 1289 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 453 + 467 = 920 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 26 × 28 = 736 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 299 + 989 = 1288 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 12 × 74 = 889 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 395 + 222 = 623 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 442 + 723 = 1165 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 721 + 606 = 1328 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 255 + 384 = 647 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 30 × 16 = 480 right or wrong? (a) Wrong (b) Right

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