Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 803 · 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 36 × 41 = 1471 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 218 + 392 = 610 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 62 × 87 = 5394 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 52 × 69 = 3581 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 360 + 279 = 639 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 84 × 24 = 2013 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 109 + 882 = 991 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 807 + 174 = 984 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 676 + 823 = 1495 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 25 × 14 = 346 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 60 × 62 = 3720 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 36 × 16 = 571 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 44 × 67 = 2940 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 14 × 20 = 280 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 796 + 673 = 1469 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 87 × 60 = 5220 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 58 × 29 = 1675 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 874 + 746 = 1626 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 168 + 797 = 974 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 47 × 84 = 3955 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 750 + 522 = 1281 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 664 + 338 = 1009 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 340 + 254 = 585 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 864 + 823 = 1695 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 24 × 77 = 1848 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 753 + 880 = 1633 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 38 × 27 = 1026 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 68 × 46 = 3128 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 118 + 121 = 238 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 288 + 669 = 956 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 377 + 400 = 777 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 70 × 22 = 1540 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 24 × 31 = 738 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 86 × 28 = 2412 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 96 × 49 = 4704 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 232 + 774 = 1006 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 34 × 88 = 3001 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 728 + 824 = 1552 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 150 + 494 = 644 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 87 × 72 = 6271 right or wrong? (a) Right (b) Wrong

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