Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 641 · 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 830 + 660 = 1495 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 989 + 396 = 1385 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 13 × 25 = 317 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 723 + 758 = 1487 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 295 + 330 = 624 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 545 + 732 = 1277 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 819 + 177 = 999 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 58 × 32 = 1856 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 737 + 411 = 1154 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 78 × 24 = 1872 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 821 + 453 = 1274 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 66 × 49 = 3233 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 91 × 44 = 4013 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 450 + 807 = 1260 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 23 × 92 = 2116 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 246 + 892 = 1136 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 55 × 46 = 2530 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 56 × 51 = 2859 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 70 × 84 = 5880 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 133 + 618 = 746 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 396 + 337 = 733 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 160 + 316 = 473 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 710 + 301 = 1011 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 77 × 60 = 4620 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 87 × 81 = 7047 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 435 + 769 = 1204 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 468 + 457 = 925 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 330 + 277 = 607 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 784 + 500 = 1275 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 220 + 605 = 825 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 58 × 32 = 1860 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 246 + 605 = 846 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 67 = 2010 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 24 × 32 = 768 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 31 × 63 = 1953 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 35 × 91 = 3185 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 25 × 17 = 433 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 60 × 52 = 3120 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 81 × 54 = 4374 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 48 × 95 = 4560 right or wrong? (a) Right (b) Wrong

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