Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 78 · 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 24 × 26 = 625 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 55 × 24 = 1320 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 274 + 339 = 613 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 602 + 746 = 1345 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 346 + 304 = 650 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 45 × 57 = 2565 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 53 × 32 = 1705 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 605 + 911 = 1516 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 66 × 57 = 3769 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 95 × 14 = 1330 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 34 × 80 = 2715 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 89 × 27 = 2395 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 368 + 671 = 1037 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 74 × 90 = 6660 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 768 + 563 = 1331 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 76 × 94 = 7151 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 64 × 28 = 1792 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 750 + 846 = 1596 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 71 × 44 = 3124 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 60 × 65 = 3907 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 89 × 12 = 1066 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 407 + 562 = 961 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 628 + 542 = 1170 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 65 × 76 = 4936 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 125 + 604 = 731 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 12 × 38 = 456 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 59 × 27 = 1593 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 90 × 56 = 5040 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 80 × 98 = 7832 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 372 + 287 = 668 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 55 × 39 = 2142 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 157 + 814 = 971 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 28 × 29 = 812 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 89 × 19 = 1691 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 67 × 45 = 3015 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 717 + 542 = 1259 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 844 + 123 = 975 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 76 = 6384 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 42 × 77 = 3229 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 20 × 74 = 1474 right or wrong? (a) Wrong (b) Right

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