Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 187 · 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 972 + 250 = 1218 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 379 + 775 = 1147 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 93 × 57 = 5295 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 782 + 669 = 1451 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 28 × 62 = 1736 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 17 × 15 = 255 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 62 × 77 = 4774 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 64 × 85 = 5440 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 796 + 818 = 1610 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 931 + 261 = 1183 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 24 × 46 = 1104 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 252 + 414 = 664 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 238 + 537 = 771 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 901 + 422 = 1323 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 674 + 947 = 1621 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 84 × 81 = 6801 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 22 × 15 = 337 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 391 + 846 = 1237 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 50 × 33 = 1649 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 823 + 847 = 1676 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 48 × 45 = 2152 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 31 × 24 = 744 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 15 × 25 = 375 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 510 + 322 = 832 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 76 × 72 = 5472 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 50 × 16 = 809 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 80 × 72 = 5762 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 40 × 26 = 1049 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 64 = 1668 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 73 × 59 = 4306 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 882 + 772 = 1650 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 38 × 43 = 1634 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 785 + 754 = 1539 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 75 × 37 = 2775 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 17 × 48 = 819 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 491 + 261 = 752 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 36 × 83 = 2984 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 527 + 537 = 1063 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 13 × 45 = 582 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 373 + 569 = 948 right or wrong? (a) Right (b) Wrong

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