Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 251 · 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 32 × 63 = 2016 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 97 × 60 = 5820 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 26 × 30 = 787 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 164 + 509 = 678 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 304 + 117 = 418 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 730 + 994 = 1724 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 678 + 189 = 866 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 549 + 196 = 741 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 41 × 12 = 492 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 360 + 445 = 810 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 833 + 784 = 1617 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 68 × 85 = 5781 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 35 × 17 = 595 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 62 × 70 = 4340 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 83 × 48 = 3976 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 45 × 52 = 2348 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 248 + 485 = 741 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 17 × 14 = 238 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 31 × 87 = 2689 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 269 + 808 = 1073 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 837 + 157 = 994 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 308 + 796 = 1101 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 839 + 116 = 955 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 419 + 283 = 698 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 34 × 89 = 3026 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 48 × 80 = 3840 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 26 × 49 = 1276 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 56 × 25 = 1400 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 48 × 30 = 1440 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 768 + 676 = 1444 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 77 × 41 = 3157 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 99 × 49 = 4857 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 14 × 75 = 1050 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 29 × 49 = 1423 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 454 + 551 = 1005 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 16 × 61 = 976 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 88 × 48 = 4224 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 177 + 194 = 371 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 240 + 146 = 388 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 81 × 88 = 7128 right or wrong? (a) Right (b) Wrong

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