Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 152 · 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 444 + 710 = 1154 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 786 + 692 = 1478 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 633 + 258 = 891 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 22 × 98 = 2156 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 71 × 73 = 5186 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 74 × 34 = 2516 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 527 + 889 = 1409 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 461 + 642 = 1103 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 350 + 575 = 925 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 28 × 84 = 2352 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 51 × 80 = 4080 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 85 × 42 = 3567 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 83 × 34 = 2814 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 36 × 20 = 722 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 881 + 740 = 1621 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 27 × 48 = 1296 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 68 × 79 = 5366 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 68 × 33 = 2238 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 341 + 413 = 753 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 326 + 326 = 659 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 208 + 741 = 940 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 860 + 144 = 1006 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 889 + 941 = 1829 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 64 × 51 = 3265 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 146 + 700 = 839 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 50 × 32 = 1597 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 446 + 887 = 1333 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 83 × 41 = 3403 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 197 + 701 = 906 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 31 × 88 = 2720 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 62 × 38 = 2356 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 265 + 815 = 1080 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 93 × 17 = 1581 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 22 × 86 = 1891 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 595 + 492 = 1090 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 478 + 207 = 685 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 72 × 45 = 3241 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 403 + 756 = 1151 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 74 × 59 = 4366 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 49 × 40 = 1960 right or wrong? (a) Wrong (b) Right

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