Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 675 · 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 43 × 27 = 1161 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 986 + 108 = 1092 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 614 + 967 = 1581 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 39 × 76 = 2959 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 62 × 46 = 2845 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 427 + 768 = 1194 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 86 × 48 = 4122 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 75 × 89 = 6675 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 639 + 920 = 1560 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 870 + 126 = 996 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 868 + 239 = 1107 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 88 × 85 = 7487 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 32 × 69 = 2212 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 79 × 76 = 6004 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 44 × 77 = 3388 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 66 × 74 = 4883 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 26 × 22 = 568 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 35 × 81 = 2835 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 44 × 13 = 578 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 95 × 65 = 6183 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 912 + 427 = 1339 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 646 + 114 = 758 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 92 × 35 = 3212 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 50 × 14 = 700 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 93 × 67 = 6231 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 83 × 33 = 2742 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 62 × 41 = 2542 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 12 × 22 = 256 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 85 × 79 = 6715 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 34 × 55 = 1870 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 23 × 24 = 560 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 25 × 52 = 1307 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 526 + 621 = 1142 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 65 × 60 = 3900 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 20 × 86 = 1719 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 78 × 47 = 3666 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 46 × 99 = 4554 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 16 × 50 = 802 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 95 × 31 = 2945 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 162 + 626 = 788 right or wrong? (a) Right (b) Wrong

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