Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 996 · 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 405 + 543 = 940 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 27 × 80 = 2159 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 68 × 90 = 6123 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 66 × 93 = 6138 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 962 + 853 = 1809 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 19 × 35 = 670 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 398 + 865 = 1263 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 52 × 24 = 1239 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 133 + 216 = 350 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 868 + 296 = 1163 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 539 + 880 = 1419 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 65 × 35 = 2272 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 36 × 77 = 2769 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 62 × 77 = 4774 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 97 × 13 = 1262 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 22 × 63 = 1393 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 80 × 80 = 6400 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 154 + 629 = 783 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 223 + 495 = 718 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 77 × 97 = 7469 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 105 + 874 = 979 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 848 + 222 = 1066 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 68 × 18 = 1222 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 397 + 274 = 671 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 35 × 39 = 1365 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 18 × 35 = 630 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 20 × 62 = 1240 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 857 + 568 = 1425 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 90 × 88 = 7920 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 18 × 61 = 1093 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 377 + 868 = 1239 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 938 + 742 = 1680 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 758 + 819 = 1577 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 322 + 823 = 1146 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 820 + 392 = 1212 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 54 × 21 = 1137 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 36 × 28 = 1008 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 381 + 465 = 844 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 43 × 36 = 1548 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 22 × 62 = 1356 right or wrong? (a) Right (b) Wrong

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