Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 14 · 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 31 × 89 = 2750 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 59 × 25 = 1475 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 66 × 59 = 3887 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 706 + 706 = 1412 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 26 × 85 = 2217 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 320 + 360 = 680 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 16 = 336 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 91 × 23 = 2093 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 63 × 24 = 1512 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 724 + 773 = 1497 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 284 + 858 = 1142 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 76 × 67 = 5092 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 49 = 1274 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 14 × 28 = 392 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 55 × 47 = 2593 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 12 × 95 = 1140 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 107 + 714 = 823 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 71 × 99 = 7029 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 859 + 714 = 1570 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 54 × 42 = 2274 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 82 × 60 = 4918 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 767 + 694 = 1461 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 83 × 68 = 5644 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 795 + 667 = 1462 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 931 + 768 = 1705 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 24 × 67 = 1614 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 583 + 666 = 1249 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 756 + 724 = 1473 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 997 + 298 = 1297 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 371 + 180 = 551 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 720 + 220 = 932 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 486 + 125 = 608 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 955 + 160 = 1116 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 847 + 406 = 1255 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 413 + 346 = 759 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 826 + 934 = 1760 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 67 × 74 = 4963 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 595 + 483 = 1069 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 405 + 220 = 633 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 57 × 47 = 2687 right or wrong? (a) Right (b) Wrong

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