Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 835 · 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 858 + 961 = 1819 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 324 + 567 = 891 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 193 + 479 = 663 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 27 × 13 = 351 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 689 + 129 = 818 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 62 × 54 = 3348 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 158 + 816 = 973 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 63 × 39 = 2454 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 44 × 49 = 2156 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 446 + 113 = 559 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 44 × 22 = 960 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 199 + 255 = 454 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 89 × 51 = 4531 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 451 + 718 = 1169 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 31 × 60 = 1860 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 956 + 865 = 1821 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 89 × 58 = 5156 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 73 × 89 = 6497 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 845 + 246 = 1091 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 93 × 99 = 9202 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 14 × 84 = 1176 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 357 + 386 = 743 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 239 + 502 = 741 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 769 + 888 = 1658 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 931 + 650 = 1584 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 988 + 125 = 1110 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 923 + 113 = 1032 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 98 × 96 = 9408 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 981 + 813 = 1786 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 970 + 298 = 1268 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 34 × 51 = 1738 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 66 × 75 = 4941 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 584 + 585 = 1169 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 61 × 78 = 4758 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 31 × 77 = 2387 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 589 + 180 = 769 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 55 × 81 = 4455 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 515 + 696 = 1211 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 29 × 49 = 1421 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 87 × 55 = 4785 right or wrong? (a) Wrong (b) Right

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