Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 677 · 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 54 × 70 = 3789 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 368 + 286 = 654 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 652 + 624 = 1273 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 332 + 684 = 1015 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 26 × 70 = 1820 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 427 + 216 = 643 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 225 + 163 = 388 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 65 × 64 = 4169 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 691 + 194 = 886 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 482 + 898 = 1377 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 64 × 44 = 2816 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 675 + 191 = 866 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 901 + 993 = 1886 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 81 × 17 = 1372 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 75 × 93 = 6977 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 241 + 241 = 488 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 82 × 83 = 6806 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 66 × 45 = 2966 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 26 × 33 = 863 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 97 × 35 = 3395 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 659 + 976 = 1626 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 892 + 890 = 1786 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 820 + 478 = 1302 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 545 + 582 = 1118 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 65 × 56 = 3640 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 44 × 84 = 3696 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 42 × 74 = 3108 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 67 × 25 = 1675 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 830 + 819 = 1652 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 279 + 884 = 1163 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 332 + 975 = 1307 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 507 + 551 = 1064 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 74 × 28 = 2072 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 12 × 86 = 1033 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 54 × 17 = 918 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 21 × 55 = 1155 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 37 × 99 = 3663 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 68 × 56 = 3817 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 74 × 46 = 3403 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 592 + 251 = 843 right or wrong? (a) Right (b) Wrong

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