Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 564 · 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 73 × 12 = 876 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 99 × 89 = 8805 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 648 + 711 = 1357 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 74 × 56 = 4144 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 36 × 30 = 1080 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 46 × 39 = 1794 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 25 × 70 = 1758 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 68 × 88 = 5984 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 113 + 435 = 554 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 48 = 1051 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 24 × 46 = 1104 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 92 × 17 = 1564 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 530 + 278 = 808 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 604 + 854 = 1451 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 72 × 96 = 6912 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 182 + 436 = 618 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 67 × 35 = 2350 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 47 × 76 = 3572 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 517 + 357 = 868 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 813 + 418 = 1239 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 26 × 67 = 1742 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 32 × 77 = 2464 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 890 + 308 = 1198 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 76 × 95 = 7213 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 12 × 45 = 541 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 69 × 34 = 2346 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 276 + 188 = 464 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 218 + 743 = 961 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 24 × 23 = 543 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 977 + 733 = 1710 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 755 + 197 = 952 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 221 + 986 = 1207 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 83 × 38 = 3154 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 375 + 296 = 665 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 721 + 148 = 878 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 316 + 794 = 1110 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 72 × 27 = 1944 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 31 × 64 = 1984 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 472 + 555 = 1036 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 23 × 57 = 1313 right or wrong? (a) Wrong (b) Right

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