Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 264 · 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 329 + 485 = 814 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 91 × 88 = 8005 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 599 + 440 = 1039 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 821 + 733 = 1554 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 99 × 41 = 4059 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 275 + 477 = 746 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 99 × 64 = 6336 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 603 + 715 = 1318 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 45 × 26 = 1170 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 49 × 41 = 2009 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 67 × 61 = 4092 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 24 × 39 = 938 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 208 + 153 = 358 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 76 × 72 = 5474 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 275 + 205 = 489 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 506 + 988 = 1492 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 564 + 532 = 1087 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 169 + 747 = 916 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 51 × 19 = 967 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 389 + 925 = 1321 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 12 × 99 = 1188 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 776 + 976 = 1746 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 861 + 926 = 1787 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 41 × 64 = 2624 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 279 + 412 = 699 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 27 × 87 = 2349 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 46 × 72 = 3312 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 92 × 35 = 3225 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 775 + 312 = 1087 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 109 + 903 = 1004 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 118 + 415 = 533 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 68 × 53 = 3600 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 771 + 336 = 1110 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 359 + 285 = 644 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 92 × 51 = 4697 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 31 × 50 = 1543 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 857 + 835 = 1684 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 49 × 82 = 4015 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 57 × 69 = 3933 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 361 + 158 = 528 right or wrong? (a) Wrong (b) Right

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