Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 604 · 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 25 × 57 = 1425 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 84 × 67 = 5628 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 42 × 73 = 3066 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 325 + 892 = 1224 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 161 + 450 = 619 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 859 + 357 = 1219 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 329 + 359 = 690 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 510 + 318 = 819 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 720 + 852 = 1572 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 83 × 39 = 3237 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 272 + 565 = 833 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 76 × 14 = 1064 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 460 + 360 = 820 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 34 × 13 = 441 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 609 + 502 = 1111 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 778 + 854 = 1632 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 550 + 431 = 987 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 360 + 742 = 1102 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 95 × 47 = 4458 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 120 + 417 = 537 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 22 × 75 = 1650 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 17 × 47 = 791 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 66 × 46 = 3036 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 469 + 679 = 1148 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 91 × 62 = 5644 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 19 × 63 = 1205 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 27 × 46 = 1242 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 175 + 610 = 781 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 85 × 45 = 3825 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 36 × 41 = 1482 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 306 + 720 = 1035 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 25 × 27 = 672 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 107 + 347 = 448 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 831 + 819 = 1650 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 889 + 798 = 1695 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 455 + 505 = 960 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 477 + 146 = 619 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 12 × 37 = 444 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 169 + 739 = 908 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 13 × 83 = 1083 right or wrong? (a) Right (b) Wrong

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