Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 620 · 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 26 × 71 = 1846 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 699 + 349 = 1048 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 816 + 741 = 1552 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 14 × 71 = 994 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 233 + 991 = 1227 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 46 × 89 = 4090 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 60 × 28 = 1679 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 42 × 43 = 1806 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 82 × 81 = 6642 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 523 + 749 = 1272 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 72 × 90 = 6483 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 22 × 15 = 330 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 18 × 67 = 1204 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 70 × 52 = 3648 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 85 × 22 = 1870 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 757 + 820 = 1577 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 93 × 38 = 3540 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 896 + 154 = 1050 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 29 × 18 = 522 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 315 + 313 = 628 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 27 × 61 = 1647 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 432 + 496 = 923 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 533 + 217 = 750 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 406 + 170 = 576 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 503 + 534 = 1035 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 892 + 436 = 1328 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 890 + 631 = 1521 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 186 + 195 = 381 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 54 × 54 = 2910 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 97 × 55 = 5335 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 32 × 41 = 1312 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 224 + 483 = 707 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 792 + 299 = 1091 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 95 × 31 = 2948 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 194 + 906 = 1100 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 62 × 78 = 4838 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 384 + 574 = 958 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 157 + 924 = 1081 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 50 × 95 = 4750 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 673 + 348 = 1015 right or wrong? (a) Wrong (b) Right

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