Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 319 · 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 644 + 880 = 1529 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 19 × 47 = 894 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 51 × 45 = 2292 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 60 × 15 = 891 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 81 × 54 = 4365 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 61 × 22 = 1346 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 699 + 461 = 1160 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 776 + 364 = 1144 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 440 + 253 = 688 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 74 × 95 = 7030 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 45 × 37 = 1670 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 717 + 199 = 913 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 78 × 62 = 4836 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 95 × 77 = 7315 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 979 + 807 = 1778 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 886 + 766 = 1659 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 14 × 40 = 554 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 54 × 87 = 4698 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 67 × 31 = 2074 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 33 × 89 = 2937 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 93 × 24 = 2232 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 56 × 47 = 2632 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 45 × 24 = 1079 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 35 × 78 = 2723 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 233 + 769 = 1002 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 816 + 156 = 972 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 830 + 724 = 1554 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 99 × 93 = 9207 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 33 × 59 = 1947 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 71 × 29 = 2059 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 432 + 682 = 1113 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 619 + 155 = 781 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 74 × 70 = 5180 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 899 + 316 = 1215 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 25 × 28 = 694 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 180 + 755 = 935 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 40 × 70 = 2800 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 392 + 742 = 1134 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 79 × 74 = 5839 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 516 + 749 = 1265 right or wrong? (a) Right (b) Wrong

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