Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 782 · 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 35 × 12 = 416 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 914 + 821 = 1742 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 925 + 688 = 1611 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 89 × 42 = 3738 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 405 + 437 = 838 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 18 × 62 = 1116 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 60 × 58 = 3480 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 373 + 151 = 515 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 621 + 647 = 1268 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 667 + 293 = 952 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 291 + 387 = 672 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 919 + 211 = 1130 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 965 + 163 = 1128 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 886 + 595 = 1481 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 609 + 734 = 1342 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 635 + 721 = 1356 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 72 × 31 = 2232 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 812 + 852 = 1664 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 424 + 339 = 766 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 475 + 742 = 1217 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 188 + 400 = 588 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 647 + 738 = 1387 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 16 × 57 = 912 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 34 × 19 = 646 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 279 + 727 = 1006 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 329 + 133 = 462 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 64 × 79 = 5056 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 95 × 23 = 2176 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 913 + 133 = 1046 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 532 + 414 = 946 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 313 + 834 = 1146 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 23 × 39 = 890 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 97 × 34 = 3294 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 35 × 47 = 1645 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 29 × 53 = 1537 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 82 × 31 = 2542 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 17 × 74 = 1249 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 270 + 139 = 406 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 34 × 78 = 2647 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 32 × 60 = 1918 right or wrong? (a) Right (b) Wrong

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