Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 506 · 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 873 + 779 = 1650 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 158 + 705 = 861 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 409 + 761 = 1170 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 673 + 495 = 1169 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 55 × 63 = 3465 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 405 + 393 = 798 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 873 + 602 = 1471 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 34 × 45 = 1530 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 22 × 27 = 594 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 44 = 965 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 37 × 31 = 1147 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 941 + 167 = 1108 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 44 × 72 = 3175 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 19 × 87 = 1660 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 44 × 62 = 2730 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 490 + 768 = 1250 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 661 + 551 = 1212 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 766 + 838 = 1602 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 62 × 67 = 4155 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 21 × 19 = 406 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 59 × 61 = 3595 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 846 + 962 = 1808 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 88 × 72 = 6336 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 849 + 926 = 1775 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 98 × 25 = 2457 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 780 + 880 = 1654 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 315 + 118 = 433 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 159 + 618 = 777 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 69 × 17 = 1173 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 620 + 387 = 1001 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 97 × 43 = 4171 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 36 × 82 = 2952 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 930 + 950 = 1880 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 523 + 737 = 1263 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 455 + 133 = 588 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 38 × 91 = 3458 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 70 × 66 = 4620 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 188 + 660 = 855 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 315 + 574 = 889 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 565 + 326 = 892 right or wrong? (a) Wrong (b) Right

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