Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 258 · 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 94 × 22 = 2068 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 95 × 59 = 5605 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 123 + 891 = 1014 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 819 + 863 = 1691 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 600 + 617 = 1211 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 295 + 410 = 705 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 22 × 26 = 575 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 169 + 571 = 740 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 65 × 95 = 6175 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 974 + 528 = 1499 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 759 + 753 = 1512 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 35 × 79 = 2763 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 24 × 68 = 1627 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 378 + 905 = 1289 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 809 + 537 = 1344 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 60 × 97 = 5819 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 15 × 12 = 180 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 406 + 513 = 919 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 160 + 581 = 743 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 872 + 749 = 1621 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 255 + 517 = 780 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 163 + 763 = 929 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 94 = 1222 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 29 × 30 = 870 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 922 + 430 = 1352 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 48 × 94 = 4516 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 58 × 22 = 1284 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 67 × 83 = 5554 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 162 + 571 = 733 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 66 × 83 = 5478 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 409 + 875 = 1277 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 313 + 759 = 1072 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 95 × 36 = 3429 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 464 + 809 = 1273 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 460 + 582 = 1042 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 93 × 85 = 7910 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 435 + 156 = 591 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 74 × 96 = 7112 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 33 × 82 = 2706 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 37 × 45 = 1670 right or wrong? (a) Right (b) Wrong

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