Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 345 · 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 17 × 93 = 1581 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 218 + 167 = 382 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 644 + 903 = 1547 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 14 × 69 = 974 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 36 × 78 = 2799 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 59 × 86 = 5074 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 973 + 240 = 1213 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 76 × 70 = 5320 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 180 + 588 = 764 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 966 + 789 = 1746 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 48 × 84 = 4029 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 197 + 121 = 318 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 28 × 49 = 1379 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 37 × 29 = 1073 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 527 + 747 = 1274 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 27 × 33 = 891 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 70 × 39 = 2726 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 597 + 819 = 1410 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 89 × 19 = 1691 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 347 + 347 = 703 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 829 + 368 = 1197 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 38 × 87 = 3306 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 282 + 818 = 1100 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 825 + 761 = 1586 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 89 × 99 = 8815 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 43 × 37 = 1591 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 16 × 40 = 640 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 90 × 49 = 4410 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 24 × 15 = 360 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 21 × 48 = 1008 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 92 × 84 = 7723 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 642 + 857 = 1499 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 52 = 1932 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 768 + 253 = 1021 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 28 × 33 = 927 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 703 + 316 = 1028 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 74 × 94 = 6956 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 77 × 24 = 1848 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 81 × 61 = 4941 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 282 + 746 = 1027 right or wrong? (a) Right (b) Wrong

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