Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 250 · 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 93 × 46 = 4278 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 844 + 695 = 1548 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 117 + 265 = 389 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 342 + 801 = 1143 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 44 × 65 = 2851 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 22 × 79 = 1738 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 23 × 63 = 1440 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 51 × 85 = 4335 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 568 + 432 = 1002 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 94 × 95 = 8930 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 25 × 85 = 2117 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 93 × 53 = 4931 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 43 × 20 = 860 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 78 = 1791 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 62 × 39 = 2418 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 44 × 27 = 1188 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 84 × 92 = 7728 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 84 × 24 = 2016 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 29 × 14 = 413 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 34 × 54 = 1836 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 617 + 625 = 1246 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 127 + 638 = 771 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 12 × 74 = 888 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 17 × 14 = 240 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 810 + 131 = 941 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 70 × 55 = 3857 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 206 + 927 = 1133 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 87 × 13 = 1140 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 256 + 905 = 1161 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 136 + 839 = 975 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 65 × 33 = 2145 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 89 × 35 = 3115 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 60 × 50 = 3000 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 175 + 360 = 535 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 81 × 33 = 2669 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 34 × 57 = 1934 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 263 + 653 = 916 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 91 × 89 = 8099 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 70 × 53 = 3710 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 45 × 13 = 585 right or wrong? (a) Right (b) Wrong

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