Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 278 · 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 418 + 595 = 1013 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 779 + 321 = 1100 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 867 + 988 = 1855 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 91 × 59 = 5369 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 12 × 89 = 1065 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 93 × 72 = 6696 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 499 + 246 = 750 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 86 × 50 = 4306 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 32 × 76 = 2432 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 534 + 706 = 1242 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 59 × 95 = 5601 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 30 × 52 = 1560 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 40 × 75 = 3004 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 174 + 506 = 676 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 38 × 49 = 1862 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 55 × 20 = 1100 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 64 × 43 = 2752 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 566 + 720 = 1284 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 188 + 428 = 616 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 36 × 82 = 2952 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 43 × 53 = 2272 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 205 + 432 = 637 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 123 + 503 = 628 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 527 + 205 = 732 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 418 + 718 = 1127 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 66 × 58 = 3828 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 310 + 459 = 769 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 78 × 62 = 4837 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 25 × 50 = 1250 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 74 × 92 = 6817 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 343 + 395 = 738 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 76 × 12 = 908 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 721 + 980 = 1701 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 776 + 114 = 883 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 492 + 365 = 857 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 63 × 95 = 5980 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 34 × 15 = 506 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 58 × 89 = 5171 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 777 + 540 = 1317 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 12 × 40 = 480 right or wrong? (a) Wrong (b) Right

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