Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 954 · 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 34 × 61 = 2083 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 94 × 86 = 8084 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 868 + 140 = 1013 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 44 × 73 = 3212 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 860 + 799 = 1659 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 731 + 467 = 1198 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 13 × 92 = 1196 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 71 × 85 = 6033 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 94 × 12 = 1128 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 31 × 24 = 742 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 29 × 88 = 2557 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 439 + 587 = 1018 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 88 × 85 = 7480 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 511 + 318 = 829 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 69 × 14 = 966 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 44 × 63 = 2772 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 726 + 953 = 1679 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 638 + 904 = 1542 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 202 + 784 = 986 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 532 + 969 = 1494 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 81 × 46 = 3721 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 68 × 61 = 4148 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 684 + 105 = 789 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 826 + 618 = 1444 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 773 + 900 = 1676 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 26 × 91 = 2366 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 84 × 56 = 4701 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 45 × 69 = 3097 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 17 × 99 = 1688 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 938 + 767 = 1705 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 34 × 27 = 918 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 760 + 791 = 1552 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 15 × 91 = 1365 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 32 × 64 = 2044 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 325 + 310 = 640 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 23 × 50 = 1150 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 39 × 30 = 1170 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 866 + 848 = 1723 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 61 × 33 = 2007 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 95 × 17 = 1621 right or wrong? (a) Wrong (b) Right

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