Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 809 · 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 39 × 89 = 3467 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 817 + 494 = 1311 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 90 × 21 = 1890 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 74 × 46 = 3404 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 282 + 899 = 1174 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 52 × 14 = 729 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 37 × 35 = 1301 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 840 + 422 = 1262 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 383 + 135 = 519 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 25 × 31 = 775 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 923 + 469 = 1395 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 966 + 915 = 1881 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 479 + 652 = 1131 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 729 + 309 = 1047 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 52 × 50 = 2600 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 92 × 41 = 3772 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 36 × 54 = 1950 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 244 + 784 = 1024 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 28 × 31 = 868 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 99 × 75 = 7425 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 605 + 240 = 845 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 768 + 739 = 1507 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 293 + 497 = 797 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 67 × 38 = 2553 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 894 + 616 = 1506 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 56 × 19 = 1064 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 77 × 36 = 2772 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 310 + 202 = 509 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 37 × 83 = 3071 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 749 + 595 = 1344 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 989 + 536 = 1525 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 20 × 56 = 1129 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 52 × 80 = 4164 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 42 × 25 = 1050 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 955 + 718 = 1673 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 516 + 214 = 730 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 78 × 31 = 2418 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 364 + 730 = 1094 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 589 + 882 = 1471 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 12 × 14 = 167 right or wrong? (a) Right (b) Wrong

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