Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 241 · 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 496 + 329 = 825 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 980 + 200 = 1180 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 27 × 31 = 831 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 296 + 383 = 679 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 32 × 53 = 1702 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 722 + 309 = 1031 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 906 + 612 = 1518 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 82 × 74 = 6068 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 49 × 90 = 4403 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 18 × 37 = 661 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 764 + 447 = 1211 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 362 + 144 = 506 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 440 + 985 = 1422 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 487 + 598 = 1084 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 95 × 32 = 3041 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 81 × 85 = 6888 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 458 + 472 = 927 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 643 + 818 = 1456 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 119 + 492 = 608 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 819 + 566 = 1389 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 36 × 40 = 1440 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 64 × 21 = 1344 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 63 × 18 = 1138 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 356 + 988 = 1344 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 815 + 187 = 1004 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 38 × 49 = 1869 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 65 × 20 = 1295 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 29 × 80 = 2312 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 837 + 948 = 1785 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 89 × 64 = 5696 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 24 × 60 = 1442 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 78 × 56 = 4368 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 59 × 26 = 1536 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 239 + 905 = 1142 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 34 × 15 = 506 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 822 + 892 = 1714 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 20 × 54 = 1080 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 13 × 85 = 1104 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 25 × 45 = 1125 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 38 × 90 = 3420 right or wrong? (a) Right (b) Wrong

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