Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 77 · 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 62 × 93 = 5766 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 857 + 859 = 1716 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 27 × 60 = 1620 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 984 + 324 = 1306 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 22 × 66 = 1446 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 221 + 585 = 797 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 60 × 57 = 3416 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 22 × 64 = 1408 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 279 + 143 = 422 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 67 × 68 = 4559 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 27 × 70 = 1890 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 933 + 312 = 1252 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 971 + 455 = 1427 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 33 × 18 = 594 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 776 + 614 = 1392 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 831 + 179 = 1002 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 82 × 57 = 4668 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 95 × 24 = 2280 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 93 = 1953 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 78 × 27 = 2100 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 242 + 468 = 712 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 76 × 14 = 1056 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 587 + 165 = 752 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 230 + 763 = 986 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 63 × 45 = 2835 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 60 × 75 = 4500 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 68 × 61 = 4152 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 317 + 423 = 734 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 865 + 626 = 1488 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 15 × 50 = 752 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 97 × 51 = 4947 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 997 + 106 = 1103 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 614 + 455 = 1069 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 253 + 928 = 1178 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 338 + 456 = 797 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 50 × 31 = 1550 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 96 × 33 = 3168 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 256 + 651 = 903 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 16 × 58 = 924 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 57 × 99 = 5643 right or wrong? (a) Right (b) Wrong

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