Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 174 · 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 97 × 46 = 4462 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 912 + 563 = 1475 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 83 × 17 = 1404 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 837 + 222 = 1059 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 90 × 34 = 3060 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 832 + 490 = 1329 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 588 + 675 = 1263 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 182 + 926 = 1108 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 26 × 53 = 1374 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 13 × 29 = 368 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 35 × 44 = 1540 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 46 × 15 = 685 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 61 × 17 = 1038 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 106 + 986 = 1092 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 811 + 663 = 1472 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 67 × 39 = 2612 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 28 × 61 = 1708 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 42 × 38 = 1596 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 19 × 48 = 912 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 391 + 725 = 1116 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 54 × 41 = 2214 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 86 × 48 = 4134 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 182 + 319 = 500 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 39 × 54 = 2106 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 90 × 75 = 6758 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 465 + 331 = 796 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 74 × 97 = 7178 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 49 × 65 = 3192 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 69 × 35 = 2415 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 183 + 827 = 1011 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 548 + 835 = 1389 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 20 × 85 = 1699 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 32 × 23 = 733 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 87 × 56 = 4880 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 48 × 75 = 3608 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 294 + 718 = 1012 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 854 + 443 = 1297 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 699 + 484 = 1192 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 82 × 65 = 5337 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 35 × 72 = 2520 right or wrong? (a) Wrong (b) Right

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