Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 685 · 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 13 × 31 = 403 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 325 + 799 = 1127 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 38 × 39 = 1488 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 13 × 15 = 195 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 819 + 323 = 1142 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 245 + 844 = 1097 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 574 + 578 = 1152 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 567 + 176 = 743 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 364 + 911 = 1275 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 691 + 765 = 1447 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 74 × 74 = 5476 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 357 + 869 = 1221 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 60 × 16 = 960 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 66 × 37 = 2440 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 643 + 607 = 1250 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 943 + 778 = 1721 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 485 + 173 = 661 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 589 + 112 = 694 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 546 + 174 = 720 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 36 × 70 = 2518 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 71 × 52 = 3687 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 228 + 552 = 780 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 14 × 76 = 1073 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 49 × 87 = 4257 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 29 × 18 = 517 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 44 × 70 = 3080 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 59 × 34 = 2006 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 38 × 18 = 684 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 90 × 73 = 6574 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 959 + 472 = 1440 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 809 + 439 = 1249 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 419 + 504 = 923 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 21 × 52 = 1101 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 29 × 23 = 667 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 30 × 71 = 2130 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 34 × 66 = 2244 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 757 + 643 = 1406 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 33 × 64 = 2112 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 88 × 31 = 2728 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 73 × 13 = 958 right or wrong? (a) Wrong (b) Right

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