Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 539 · 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 300 + 410 = 707 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 232 + 468 = 700 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 98 × 24 = 2352 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 447 + 385 = 832 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 32 × 87 = 2776 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 41 × 81 = 3313 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 45 × 23 = 1035 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 49 × 61 = 2989 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 479 + 883 = 1362 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 17 × 36 = 612 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 598 + 379 = 982 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 29 × 85 = 2465 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 82 × 22 = 1804 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 21 × 18 = 370 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 242 + 829 = 1071 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 620 + 277 = 900 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 61 × 92 = 5603 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 94 × 55 = 5179 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 31 × 86 = 2662 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 656 + 574 = 1229 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 433 + 764 = 1199 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 74 × 68 = 5032 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 71 × 46 = 3266 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 398 + 247 = 654 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 447 + 830 = 1277 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 683 + 597 = 1280 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 150 + 857 = 1007 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 45 × 17 = 765 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 573 + 165 = 738 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 63 × 68 = 4284 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 32 × 42 = 1345 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 428 + 918 = 1353 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 32 × 38 = 1220 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 29 × 24 = 690 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 229 + 215 = 442 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 50 × 15 = 745 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 34 × 96 = 3261 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 55 × 83 = 4565 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 81 × 59 = 4786 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 201 + 906 = 1107 right or wrong? (a) Wrong (b) Right

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