Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 871 · 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 939 + 664 = 1595 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 182 + 896 = 1078 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 85 × 82 = 6970 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 45 × 92 = 4140 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 29 × 83 = 2402 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 49 × 59 = 2891 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 49 × 27 = 1321 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 35 × 66 = 2310 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 724 + 534 = 1263 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 46 × 60 = 2755 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 135 + 744 = 888 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 60 × 64 = 3840 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 505 + 317 = 822 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 66 × 40 = 2639 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 649 + 655 = 1304 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 12 × 67 = 804 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 26 × 40 = 1042 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 923 + 711 = 1634 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 212 + 710 = 922 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 14 × 45 = 630 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 86 × 75 = 6452 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 743 + 294 = 1037 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 748 + 917 = 1665 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 511 + 343 = 862 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 434 + 504 = 934 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 76 × 29 = 2208 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 367 + 788 = 1155 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 553 + 922 = 1480 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 600 + 339 = 939 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 678 + 637 = 1315 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 63 × 18 = 1134 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 49 × 47 = 2311 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 82 × 33 = 2706 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 660 + 739 = 1399 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 129 + 350 = 476 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 99 × 33 = 3266 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 157 + 703 = 860 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 31 × 74 = 2298 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 24 × 91 = 2181 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 684 + 657 = 1341 right or wrong? (a) Wrong (b) Right

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