Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 71 · 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 68 × 61 = 4148 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 481 + 554 = 1035 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 207 + 460 = 667 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 45 × 47 = 2115 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 55 × 87 = 4785 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 662 + 291 = 953 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 214 + 517 = 731 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 49 × 30 = 1473 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 74 × 51 = 3774 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 37 × 76 = 2820 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 105 + 744 = 851 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 63 × 97 = 6106 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 297 + 250 = 544 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 238 + 105 = 344 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 44 × 77 = 3395 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 321 + 802 = 1123 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 474 + 130 = 606 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 942 + 907 = 1849 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 16 × 97 = 1552 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 87 × 77 = 6699 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 70 × 81 = 5669 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 380 + 648 = 1025 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 635 + 884 = 1514 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 24 × 77 = 1848 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 14 × 98 = 1364 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 905 + 838 = 1743 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 48 × 16 = 769 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 768 + 632 = 1403 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 544 + 727 = 1271 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 23 × 15 = 345 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 35 × 85 = 2975 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 64 × 82 = 5255 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 713 + 485 = 1201 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 82 × 32 = 2633 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 665 + 246 = 911 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 26 × 16 = 409 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 256 + 159 = 415 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 67 × 61 = 4087 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 59 = 1711 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 84 × 96 = 8057 right or wrong? (a) Right (b) Wrong

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