Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 478 · 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 88 × 83 = 7297 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 41 × 82 = 3362 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 13 × 47 = 620 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 36 × 82 = 2952 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 16 × 34 = 538 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 200 + 396 = 599 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 66 × 77 = 5087 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 14 × 66 = 924 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 148 + 600 = 740 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 28 × 57 = 1596 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 749 + 866 = 1616 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 947 + 322 = 1269 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 198 + 975 = 1173 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 24 × 15 = 360 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 682 + 594 = 1276 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 27 × 22 = 587 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 46 × 81 = 3718 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 35 × 19 = 665 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 92 × 44 = 4048 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 12 × 41 = 492 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 328 + 228 = 553 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 46 × 75 = 3450 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 89 × 66 = 5874 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 546 + 108 = 654 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 996 + 598 = 1594 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 532 + 469 = 1001 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 115 + 349 = 470 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 25 × 80 = 2000 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 95 × 95 = 9019 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 21 × 36 = 749 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 39 × 12 = 468 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 41 × 93 = 3813 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 62 × 26 = 1612 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 26 × 84 = 2184 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 586 + 547 = 1133 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 54 × 95 = 5128 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 113 + 439 = 552 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 21 × 57 = 1197 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 76 × 66 = 5024 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 93 × 97 = 9025 right or wrong? (a) Wrong (b) Right

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