Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 396 · 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 59 × 52 = 3077 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 177 + 521 = 693 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 511 + 569 = 1078 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 764 + 904 = 1668 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 218 + 242 = 466 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 17 × 13 = 221 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 597 + 552 = 1149 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 278 + 154 = 432 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 78 × 81 = 6318 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 713 + 493 = 1198 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 17 × 44 = 748 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 24 × 68 = 1632 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 96 × 59 = 5664 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 148 + 799 = 948 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 353 + 564 = 923 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 27 × 68 = 1836 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 310 + 566 = 873 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 386 + 508 = 894 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 374 + 753 = 1131 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 385 + 282 = 662 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 15 × 41 = 615 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 524 + 256 = 789 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 495 + 432 = 925 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 253 + 887 = 1140 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 78 × 53 = 4134 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 30 × 52 = 1560 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 19 × 35 = 669 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 61 × 50 = 3050 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 93 × 74 = 6882 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 74 × 35 = 2596 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 89 × 84 = 7476 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 82 × 64 = 5255 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 93 × 43 = 3992 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 91 × 56 = 5096 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 463 + 250 = 722 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 212 + 530 = 742 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 650 + 198 = 857 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 25 × 22 = 543 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 96 × 19 = 1824 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 555 + 515 = 1070 right or wrong? (a) Right (b) Wrong

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