Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 828 · 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 27 × 34 = 918 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 217 + 303 = 516 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 85 × 21 = 1784 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 89 × 60 = 5340 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 527 + 975 = 1502 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 973 + 262 = 1232 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 314 + 192 = 506 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 200 + 222 = 416 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 32 × 20 = 635 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 49 × 99 = 4851 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 34 × 46 = 1564 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 85 × 28 = 2380 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 44 × 37 = 1628 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 31 × 70 = 2163 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 42 × 56 = 2352 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 12 × 59 = 708 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 57 × 19 = 1083 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 57 × 52 = 2962 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 22 × 14 = 308 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 253 + 262 = 519 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 88 × 91 = 8011 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 31 × 27 = 832 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 44 × 23 = 1012 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 173 + 646 = 827 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 76 × 34 = 2584 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 60 × 68 = 4078 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 54 × 93 = 5021 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 85 × 65 = 5525 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 28 × 53 = 1484 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 57 × 94 = 5358 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 834 + 946 = 1780 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 35 × 17 = 595 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 798 + 229 = 1032 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 97 × 72 = 6984 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 52 × 51 = 2652 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 963 + 751 = 1714 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 827 + 577 = 1403 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 300 + 756 = 1056 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 16 × 93 = 1481 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 568 + 394 = 965 right or wrong? (a) Right (b) Wrong

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