Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 9 · 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 45 × 85 = 3825 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 22 × 40 = 880 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 373 + 714 = 1087 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 85 × 35 = 2975 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 842 + 793 = 1635 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 289 + 512 = 801 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 92 × 65 = 5984 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 48 × 95 = 4556 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 783 + 135 = 918 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 29 × 19 = 557 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 414 + 503 = 909 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 108 + 253 = 361 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 940 + 791 = 1731 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 653 + 564 = 1217 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 34 × 13 = 449 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 34 × 75 = 2550 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 118 + 441 = 551 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 616 + 153 = 768 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 66 × 32 = 2112 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 947 + 149 = 1101 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 25 × 43 = 1077 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 61 × 60 = 3653 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 17 × 70 = 1190 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 142 + 699 = 841 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 67 × 37 = 2479 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 436 + 310 = 741 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 207 + 664 = 877 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 99 × 29 = 2870 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 197 + 656 = 849 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 468 + 694 = 1162 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 753 + 490 = 1243 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 60 = 1922 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 76 × 26 = 1967 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 31 × 40 = 1244 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 591 + 289 = 880 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 80 × 21 = 1683 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 43 × 67 = 2881 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 29 = 812 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 523 + 987 = 1510 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 70 × 25 = 1750 right or wrong? (a) Wrong (b) Right

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