Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 983 · 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 15 × 32 = 479 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 471 + 973 = 1443 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 732 + 699 = 1431 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 62 × 99 = 6138 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 32 × 25 = 800 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 674 + 227 = 892 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 84 × 57 = 4788 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 71 = 1775 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 996 + 460 = 1456 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 40 × 70 = 2798 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 88 × 91 = 8008 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 695 + 228 = 921 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 85 × 65 = 5521 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 173 + 726 = 898 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 54 × 66 = 3564 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 56 × 16 = 897 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 32 × 67 = 2144 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 835 + 984 = 1819 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 630 + 440 = 1064 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 883 + 932 = 1809 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 347 + 894 = 1241 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 26 × 61 = 1586 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 70 × 59 = 4130 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 994 + 268 = 1262 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 82 × 37 = 3034 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 212 + 347 = 559 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 816 + 646 = 1469 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 929 + 391 = 1320 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 276 + 687 = 963 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 65 × 98 = 6370 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 73 × 65 = 4746 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 61 × 50 = 3050 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 48 × 20 = 951 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 195 + 259 = 448 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 98 × 15 = 1463 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 36 × 33 = 1180 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 22 × 51 = 1115 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 41 × 77 = 3157 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 305 + 698 = 1003 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 320 + 434 = 754 right or wrong? (a) Wrong (b) Right

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