Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 143 · 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 113 + 545 = 658 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 164 + 776 = 931 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 157 + 205 = 371 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 87 × 60 = 5220 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 87 × 32 = 2784 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 75 × 75 = 5625 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 957 + 449 = 1406 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 79 × 51 = 4029 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 309 + 227 = 533 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 962 + 237 = 1199 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 440 + 687 = 1127 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 19 × 55 = 1045 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 482 + 995 = 1477 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 175 + 677 = 849 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 17 × 71 = 1203 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 14 × 94 = 1324 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 330 + 755 = 1087 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 75 × 69 = 5175 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 636 + 536 = 1172 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 81 × 78 = 6318 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 66 × 96 = 6329 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 68 × 42 = 2856 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 33 × 59 = 1947 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 46 × 20 = 926 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 92 = 4876 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 75 × 94 = 7050 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 73 × 25 = 1825 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 922 + 848 = 1770 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 33 × 28 = 924 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 511 + 248 = 759 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 168 + 494 = 655 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 747 + 420 = 1163 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 90 × 71 = 6391 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 51 × 18 = 918 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 845 + 119 = 971 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 756 + 980 = 1736 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 67 × 72 = 4824 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 32 = 2683 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 59 × 83 = 4905 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 78 × 17 = 1333 right or wrong? (a) Right (b) Wrong

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