Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 244 · 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 28 × 56 = 1563 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 26 × 19 = 490 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 42 × 71 = 2982 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 34 × 22 = 748 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 283 + 412 = 702 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 222 + 731 = 959 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 608 + 793 = 1410 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 16 × 46 = 727 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 245 + 987 = 1235 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 65 × 33 = 2146 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 98 × 13 = 1273 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 48 × 27 = 1296 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 215 + 827 = 1042 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 30 × 50 = 1495 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 410 + 755 = 1165 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 963 + 749 = 1713 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 945 + 789 = 1735 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 28 × 97 = 2719 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 189 + 245 = 434 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 22 × 81 = 1782 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 52 × 25 = 1304 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 76 × 26 = 1976 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 70 × 30 = 2105 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 463 + 367 = 830 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 191 + 320 = 511 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 525 + 596 = 1116 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 638 + 648 = 1289 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 20 × 69 = 1382 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 976 + 147 = 1126 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 23 × 52 = 1196 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 20 × 35 = 700 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 67 × 88 = 5896 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 81 × 69 = 5582 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 130 + 753 = 877 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 81 × 73 = 5912 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 53 × 64 = 3392 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 93 × 17 = 1581 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 83 × 29 = 2407 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 67 × 80 = 5360 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 23 × 79 = 1817 right or wrong? (a) Wrong (b) Right

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