Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 341 · 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 320 + 559 = 879 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 797 + 154 = 951 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 652 + 137 = 798 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 767 + 275 = 1042 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 203 + 994 = 1199 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 326 + 302 = 628 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 49 × 43 = 2106 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 56 × 74 = 4138 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 502 + 924 = 1423 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 36 × 25 = 900 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 18 × 75 = 1355 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 205 + 652 = 855 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 204 + 547 = 748 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 765 + 982 = 1738 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 402 + 713 = 1115 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 984 + 289 = 1279 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 675 + 805 = 1480 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 29 × 84 = 2435 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 88 × 63 = 5544 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 840 + 289 = 1131 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 757 + 989 = 1745 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 39 × 43 = 1677 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 173 + 726 = 904 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 28 × 34 = 952 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 730 + 144 = 880 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 27 × 91 = 2448 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 32 × 63 = 2007 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 32 × 36 = 1152 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 21 × 37 = 768 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 944 + 859 = 1794 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 38 = 798 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 49 × 33 = 1619 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 48 × 84 = 4028 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 77 × 51 = 3927 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 78 × 90 = 7020 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 154 + 481 = 629 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 960 + 810 = 1772 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 57 × 82 = 4674 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 732 + 110 = 842 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 72 × 34 = 2448 right or wrong? (a) Wrong (b) Right

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