Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 814 · 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 369 + 968 = 1333 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 201 + 202 = 397 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 96 × 30 = 2880 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 275 + 773 = 1048 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 710 + 850 = 1560 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 529 + 385 = 910 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 84 × 47 = 3948 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 932 + 815 = 1747 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 743 + 844 = 1586 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 94 × 20 = 1882 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 65 × 41 = 2666 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 918 + 836 = 1754 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 541 + 235 = 784 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 910 + 908 = 1818 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 53 × 59 = 3120 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 62 × 38 = 2356 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 63 × 29 = 1820 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 31 × 81 = 2512 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 350 + 164 = 512 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 884 + 630 = 1514 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 717 + 900 = 1617 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 839 + 647 = 1482 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 277 + 699 = 976 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 83 × 47 = 3901 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 36 × 50 = 1800 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 215 + 711 = 926 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 90 × 54 = 4860 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 27 × 47 = 1272 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 285 + 430 = 715 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 75 × 12 = 900 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 453 + 114 = 559 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 12 × 57 = 684 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 243 + 123 = 366 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 127 + 421 = 548 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 90 × 53 = 4768 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 734 + 135 = 869 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 22 × 64 = 1408 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 85 × 74 = 6292 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 41 × 29 = 1191 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 47 × 14 = 660 right or wrong? (a) Right (b) Wrong

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