Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 444 · 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 883 + 765 = 1650 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 51 × 96 = 4894 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 71 × 55 = 3910 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 42 × 66 = 2772 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 884 + 203 = 1080 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 351 + 418 = 769 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 73 × 33 = 2401 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 433 + 495 = 928 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 274 + 766 = 1040 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 752 + 730 = 1482 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 16 × 71 = 1136 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 175 + 251 = 426 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 248 + 252 = 500 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 249 + 421 = 662 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 604 + 685 = 1289 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 251 + 443 = 691 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 730 + 959 = 1688 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 29 × 56 = 1624 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 749 + 705 = 1446 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 576 + 826 = 1402 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 195 + 751 = 946 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 51 × 68 = 3468 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 598 + 784 = 1391 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 780 + 467 = 1244 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 24 × 62 = 1488 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 691 + 890 = 1581 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 34 × 32 = 1088 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 72 × 91 = 6552 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 241 + 638 = 878 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 391 + 540 = 927 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 673 + 953 = 1626 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 31 × 90 = 2788 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 457 + 769 = 1226 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 86 × 89 = 7645 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 174 + 329 = 505 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 277 + 957 = 1234 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 27 × 79 = 2131 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 404 + 341 = 745 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 84 × 31 = 2603 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 804 + 720 = 1524 right or wrong? (a) Wrong (b) Right

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