Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 725 · 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 49 × 72 = 3529 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 56 × 21 = 1172 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 264 + 942 = 1206 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 66 × 17 = 1117 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 646 + 860 = 1506 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 464 + 195 = 659 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 45 = 949 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 75 × 16 = 1191 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 576 + 665 = 1241 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 51 × 52 = 2652 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 84 × 40 = 3360 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 67 × 99 = 6633 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 41 × 44 = 1804 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 22 × 69 = 1518 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 19 × 91 = 1732 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 41 × 71 = 2902 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 793 + 970 = 1756 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 62 × 14 = 868 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 69 × 54 = 3726 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 703 + 168 = 869 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 844 + 204 = 1049 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 523 + 733 = 1256 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 55 × 85 = 4675 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 409 + 783 = 1192 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 59 × 72 = 4245 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 12 × 91 = 1092 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 783 + 229 = 1012 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 39 × 86 = 3354 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 736 + 605 = 1345 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 825 + 819 = 1644 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 49 × 90 = 4405 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 20 × 71 = 1420 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 20 × 53 = 1060 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 12 × 33 = 402 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 208 + 763 = 969 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 739 + 229 = 968 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 484 + 512 = 1004 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 411 + 742 = 1153 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 60 × 13 = 780 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 56 × 59 = 3310 right or wrong? (a) Wrong (b) Right

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