Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 666 · 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 94 × 73 = 6864 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 272 + 333 = 609 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 30 × 62 = 1860 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 93 × 37 = 3448 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 402 + 885 = 1287 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 432 + 422 = 848 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 26 × 16 = 416 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 777 + 889 = 1663 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 542 + 779 = 1321 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 590 + 621 = 1211 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 64 × 62 = 3959 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 655 + 354 = 1009 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 80 × 50 = 3999 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 612 + 353 = 965 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 544 + 804 = 1345 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 83 × 59 = 4889 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 75 × 16 = 1200 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 613 + 861 = 1473 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 39 × 75 = 2925 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 44 × 39 = 1712 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 548 + 429 = 977 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 50 × 60 = 2994 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 876 + 574 = 1450 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 45 × 87 = 3915 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 71 = 4191 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 66 × 46 = 3036 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 50 × 20 = 995 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 155 + 937 = 1089 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 65 × 25 = 1629 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 47 × 62 = 2905 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 48 × 83 = 3978 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 151 + 784 = 930 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 515 + 590 = 1100 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 675 + 146 = 821 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 407 + 358 = 765 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 613 + 437 = 1046 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 831 + 518 = 1349 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 71 = 5961 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 387 + 912 = 1290 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 537 + 748 = 1285 right or wrong? (a) Wrong (b) Right

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