Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 878 · 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 465 + 801 = 1266 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 542 + 464 = 1006 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 903 + 846 = 1756 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 555 + 209 = 768 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 852 + 382 = 1225 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 828 + 136 = 964 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 27 × 25 = 680 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 32 × 32 = 1027 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 348 + 647 = 992 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 125 + 690 = 815 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 950 + 147 = 1097 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 67 × 22 = 1469 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 518 + 804 = 1322 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 66 × 15 = 990 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 192 + 252 = 444 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 14 × 27 = 381 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 536 + 285 = 821 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 51 × 28 = 1428 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 69 × 88 = 6072 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 45 × 81 = 3640 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 396 + 337 = 732 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 31 × 65 = 2015 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 71 × 92 = 6537 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 16 × 81 = 1296 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 320 + 431 = 753 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 31 × 46 = 1425 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 92 × 49 = 4511 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 46 × 64 = 2944 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 108 + 766 = 866 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 40 × 18 = 720 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 149 + 674 = 831 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 69 × 55 = 3793 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 41 × 71 = 2906 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 67 × 73 = 4889 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 23 × 92 = 2123 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 712 + 737 = 1452 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 584 + 848 = 1428 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 192 + 535 = 727 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 252 + 157 = 409 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 68 × 34 = 2312 right or wrong? (a) Right (b) Wrong

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