Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 191 · 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 33 × 90 = 2965 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 99 × 59 = 5842 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 58 × 85 = 4930 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 47 × 43 = 2021 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 898 + 149 = 1047 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 85 × 40 = 3400 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 89 × 70 = 6230 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 50 × 49 = 2449 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 940 + 866 = 1806 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 365 + 146 = 510 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 40 × 65 = 2601 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 26 × 70 = 1820 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 39 × 70 = 2731 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 36 × 64 = 2304 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 30 × 67 = 2014 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 937 + 932 = 1869 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 77 × 63 = 4851 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 27 × 89 = 2403 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 51 × 84 = 4286 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 45 × 96 = 4320 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 43 × 40 = 1720 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 652 + 463 = 1108 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 75 × 81 = 6075 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 61 × 36 = 2189 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 27 × 45 = 1214 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 82 × 99 = 8124 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 99 × 65 = 6435 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 97 × 69 = 6693 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 93 × 90 = 8372 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 24 × 78 = 1872 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 752 + 111 = 863 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 266 + 277 = 545 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 60 × 36 = 2160 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 73 × 25 = 1818 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 26 × 51 = 1326 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 28 × 29 = 812 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 55 × 71 = 3905 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 73 × 52 = 3796 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 492 + 212 = 704 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 711 + 916 = 1631 right or wrong? (a) Wrong (b) Right

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