Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 376 · 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 84 × 60 = 5040 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 51 × 74 = 3774 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 718 + 130 = 845 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 59 × 85 = 5015 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 39 × 46 = 1794 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 88 × 25 = 2200 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 398 + 914 = 1320 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 542 + 860 = 1401 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 35 × 64 = 2231 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 81 × 83 = 6723 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 46 × 58 = 2665 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 353 + 322 = 682 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 833 + 341 = 1174 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 14 × 38 = 532 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 87 × 54 = 4696 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 58 × 83 = 4814 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 86 × 80 = 6883 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 816 + 646 = 1462 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 744 + 129 = 873 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 66 × 31 = 2046 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 174 + 767 = 949 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 790 + 168 = 958 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 251 + 636 = 887 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 83 × 49 = 4067 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 68 × 23 = 1564 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 888 + 302 = 1190 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 677 + 571 = 1248 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 581 + 303 = 884 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 828 + 407 = 1233 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 497 + 606 = 1103 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 50 × 17 = 845 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 361 + 893 = 1255 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 27 × 30 = 810 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 17 × 82 = 1399 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 31 × 55 = 1705 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 33 × 68 = 2244 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 170 + 477 = 640 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 21 × 22 = 465 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 57 × 42 = 2392 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 88 × 79 = 6952 right or wrong? (a) Wrong (b) Right

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