Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 417 · 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 52 × 98 = 5096 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 32 × 34 = 1081 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 37 × 20 = 740 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 408 + 127 = 539 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 90 × 68 = 6122 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 642 + 283 = 924 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 71 × 56 = 3976 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 42 × 72 = 3024 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 999 + 412 = 1403 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 524 + 451 = 979 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 64 × 98 = 6272 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 60 × 68 = 4078 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 17 × 42 = 722 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 54 × 82 = 4428 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 34 × 84 = 2855 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 16 × 22 = 353 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 405 + 490 = 887 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 36 × 78 = 2808 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 96 × 60 = 5762 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 134 + 551 = 685 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 37 × 49 = 1813 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 954 + 160 = 1114 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 909 + 446 = 1355 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 24 × 38 = 905 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 549 + 484 = 1033 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 812 + 916 = 1728 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 83 × 45 = 3730 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 282 + 401 = 683 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 99 × 12 = 1191 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 611 + 906 = 1511 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 36 × 19 = 684 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 169 + 605 = 774 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 436 + 345 = 781 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 356 + 304 = 658 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 324 + 986 = 1310 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 967 + 886 = 1853 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 60 = 1980 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 529 + 392 = 922 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 349 + 397 = 750 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 43 × 30 = 1290 right or wrong? (a) Wrong (b) Right

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