Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 139 · 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 780 + 998 = 1771 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 825 + 906 = 1731 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 460 + 357 = 817 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 90 × 90 = 8093 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 164 + 770 = 934 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 14 × 31 = 436 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 56 × 12 = 663 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 18 × 77 = 1378 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 66 × 77 = 5090 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 91 × 71 = 6461 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 289 + 781 = 1070 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 418 + 123 = 541 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 95 × 34 = 3230 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 616 + 885 = 1509 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 15 × 16 = 242 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 225 + 215 = 440 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 442 + 899 = 1332 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 900 + 766 = 1666 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 29 × 42 = 1218 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 874 + 753 = 1627 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 973 + 679 = 1657 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 676 + 238 = 914 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 21 × 52 = 1094 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 59 × 77 = 4546 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 594 + 559 = 1153 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 317 + 914 = 1231 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 570 + 503 = 1073 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 90 × 21 = 1890 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 67 × 42 = 2805 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 24 × 66 = 1575 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 22 × 15 = 330 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 80 × 46 = 3680 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 694 + 723 = 1417 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 321 + 392 = 707 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 48 × 71 = 3408 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 444 + 729 = 1178 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 15 × 75 = 1125 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 75 × 23 = 1725 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 21 × 24 = 504 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 18 × 49 = 890 right or wrong? (a) Right (b) Wrong

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