Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 377 · 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 21 × 54 = 1134 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 86 × 28 = 2406 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 36 × 35 = 1260 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 143 + 369 = 512 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 92 × 20 = 1844 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 283 + 127 = 410 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 87 × 35 = 3045 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 45 × 75 = 3375 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 56 × 29 = 1625 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 819 + 566 = 1383 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 84 × 86 = 7224 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 86 × 20 = 1724 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 316 + 470 = 795 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 29 × 92 = 2674 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 996 + 459 = 1455 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 51 × 49 = 2499 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 414 + 254 = 666 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 546 + 299 = 845 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 149 + 864 = 1004 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 859 + 690 = 1556 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 769 + 928 = 1695 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 431 + 924 = 1364 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 60 × 86 = 5160 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 579 + 755 = 1328 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 54 × 30 = 1626 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 12 = 400 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 71 × 82 = 5819 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 635 + 748 = 1383 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 489 + 807 = 1296 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 916 + 220 = 1141 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 40 × 84 = 3360 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 25 = 851 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 39 × 84 = 3274 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 66 × 30 = 1980 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 43 × 62 = 2673 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 24 × 70 = 1680 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 94 × 84 = 7891 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 216 + 959 = 1175 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 483 + 239 = 722 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 71 = 1349 right or wrong? (a) Right (b) Wrong

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