Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 249 · 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 897 + 597 = 1493 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 890 + 247 = 1137 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 83 × 49 = 4067 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 403 + 337 = 740 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 14 × 22 = 306 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 79 = 1501 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 95 × 94 = 8930 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 327 + 455 = 790 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 91 × 50 = 4554 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 77 × 21 = 1617 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 56 × 19 = 1069 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 60 × 34 = 2040 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 165 + 765 = 930 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 677 + 810 = 1492 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 17 × 19 = 323 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 82 × 59 = 4838 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 47 × 81 = 3805 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 351 + 809 = 1159 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 29 × 31 = 892 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 13 × 82 = 1066 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 218 + 538 = 764 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 632 + 505 = 1140 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 540 + 761 = 1301 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 40 × 93 = 3717 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 29 × 36 = 1040 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 753 + 462 = 1218 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 72 × 59 = 4248 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 613 + 692 = 1305 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 54 × 33 = 1777 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 261 + 660 = 921 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 72 × 95 = 6841 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 730 + 287 = 1017 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 215 + 865 = 1084 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 88 × 73 = 6424 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 327 + 970 = 1297 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 58 × 25 = 1448 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 52 × 75 = 3900 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 776 + 264 = 1040 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 29 × 57 = 1649 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 14 × 13 = 191 right or wrong? (a) Right (b) Wrong

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