Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 41 · 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 81 × 71 = 5751 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 488 + 224 = 712 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 802 + 499 = 1297 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 30 × 60 = 1800 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 94 × 24 = 2256 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 611 + 279 = 882 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 50 × 32 = 1600 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 44 × 82 = 3608 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 22 × 50 = 1101 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 15 × 19 = 285 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 792 + 801 = 1584 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 42 × 95 = 3990 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 95 × 85 = 8075 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 582 + 397 = 979 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 70 × 44 = 3086 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 70 × 70 = 4900 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 94 × 93 = 8742 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 723 + 133 = 856 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 88 = 4217 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 22 × 22 = 484 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 26 × 21 = 539 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 352 + 329 = 681 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 97 × 50 = 4842 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 39 × 27 = 1053 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 33 × 29 = 954 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 95 × 65 = 6175 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 75 × 52 = 3897 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 37 × 74 = 2739 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 22 × 62 = 1364 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 834 + 279 = 1113 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 49 × 65 = 3184 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 233 + 776 = 1009 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 20 × 99 = 1980 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 63 × 16 = 1003 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 44 × 17 = 741 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 54 × 22 = 1192 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 936 + 369 = 1303 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 39 × 78 = 3042 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 735 + 606 = 1341 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 66 × 31 = 2046 right or wrong? (a) Wrong (b) Right

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