Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 79 · 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 89 × 93 = 8282 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 65 × 68 = 4420 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 80 × 83 = 6647 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 105 + 730 = 833 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 44 × 61 = 2689 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 29 × 66 = 1914 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 18 × 41 = 741 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 780 + 633 = 1413 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 72 × 28 = 2016 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 95 × 82 = 7790 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 70 × 71 = 4969 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 73 × 29 = 2116 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 64 × 27 = 1728 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 29 × 15 = 440 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 75 × 82 = 6150 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 762 + 223 = 980 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 517 + 879 = 1396 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 664 + 225 = 889 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 887 + 650 = 1537 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 24 × 96 = 2308 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 726 + 497 = 1227 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 964 + 958 = 1927 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 56 × 83 = 4655 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 55 × 28 = 1547 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 195 + 180 = 375 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 900 + 612 = 1512 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 643 + 215 = 858 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 127 + 522 = 649 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 577 + 798 = 1375 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 888 + 674 = 1562 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 131 + 759 = 890 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 910 + 802 = 1705 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 38 × 45 = 1710 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 12 × 98 = 1176 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 54 × 16 = 858 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 26 × 36 = 936 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 484 + 724 = 1208 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 57 × 65 = 3701 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 88 × 59 = 5192 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 96 × 79 = 7584 right or wrong? (a) Wrong (b) Right

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