Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 973 · 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 689 + 655 = 1335 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 897 + 346 = 1237 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 35 × 38 = 1325 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 453 + 926 = 1379 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 77 × 58 = 4466 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 56 × 87 = 4880 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 834 + 301 = 1135 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 459 + 464 = 923 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 424 + 255 = 683 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 17 × 29 = 488 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 19 × 32 = 616 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 68 × 84 = 5708 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 551 + 981 = 1524 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 717 + 804 = 1521 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 429 + 977 = 1408 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 221 + 932 = 1158 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 666 + 957 = 1623 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 66 × 74 = 4882 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 201 + 173 = 376 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 886 + 801 = 1678 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 291 + 248 = 539 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 40 × 77 = 3080 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 71 × 60 = 4251 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 47 × 49 = 2303 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 67 × 14 = 938 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 962 + 781 = 1743 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 31 × 68 = 2105 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 28 × 57 = 1596 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 48 × 96 = 4608 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 316 + 868 = 1191 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 82 × 81 = 6642 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 76 × 65 = 4940 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 59 × 68 = 4012 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 931 + 360 = 1285 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 30 × 65 = 1950 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 24 × 23 = 552 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 32 × 82 = 2619 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 963 + 259 = 1215 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 72 × 73 = 5256 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 30 × 56 = 1688 right or wrong? (a) Wrong (b) Right

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