Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 116 · 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 44 × 20 = 880 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 66 × 40 = 2640 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 24 × 31 = 744 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 95 × 45 = 4275 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 28 × 26 = 728 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 366 + 977 = 1343 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 341 + 804 = 1146 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 26 × 64 = 1664 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 263 + 728 = 991 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 43 × 83 = 3569 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 256 + 910 = 1163 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 294 + 946 = 1235 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 88 × 21 = 1841 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 956 + 793 = 1744 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 20 × 62 = 1240 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 789 + 188 = 976 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 31 × 38 = 1174 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 165 + 631 = 796 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 683 + 648 = 1331 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 501 + 274 = 775 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 35 × 80 = 2800 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 76 × 30 = 2280 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 484 + 444 = 923 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 305 + 452 = 757 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 812 + 818 = 1632 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 770 + 480 = 1257 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 59 × 31 = 1829 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 60 × 38 = 2280 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 96 × 71 = 6814 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 187 + 982 = 1169 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 627 + 996 = 1623 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 83 × 84 = 6972 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 25 × 85 = 2132 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 660 + 457 = 1117 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 37 × 51 = 1887 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 74 × 68 = 5032 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 32 × 18 = 574 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 53 = 4451 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 588 + 275 = 863 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 61 × 49 = 2989 right or wrong? (a) Right (b) Wrong

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