Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 338 · 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 24 × 89 = 2136 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 13 × 60 = 780 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 15 × 73 = 1092 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 24 × 45 = 1080 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 84 × 39 = 3276 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 99 × 16 = 1584 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 867 + 544 = 1418 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 96 × 22 = 2118 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 59 × 81 = 4779 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 42 × 95 = 3987 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 781 + 972 = 1753 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 813 + 209 = 1024 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 98 × 21 = 2050 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 888 + 951 = 1839 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 79 × 14 = 1106 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 106 + 629 = 735 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 140 + 180 = 320 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 70 × 18 = 1260 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 52 × 78 = 4059 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 43 × 52 = 2236 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 734 + 580 = 1307 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 42 × 30 = 1251 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 48 × 45 = 2160 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 147 + 330 = 477 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 61 × 35 = 2132 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 29 × 32 = 922 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 36 × 84 = 3022 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 82 × 49 = 4011 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 308 + 641 = 949 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 422 + 362 = 780 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 294 + 713 = 1007 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 826 + 474 = 1300 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 721 + 714 = 1435 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 63 × 91 = 5733 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 46 × 82 = 3772 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 26 × 94 = 2449 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 822 + 908 = 1725 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 123 + 470 = 587 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 24 × 29 = 690 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 50 × 88 = 4400 right or wrong? (a) Right (b) Wrong

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