Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 227 · 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 71 × 28 = 1979 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 86 × 30 = 2585 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 237 + 703 = 940 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 15 × 42 = 628 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 37 × 75 = 2784 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 931 + 597 = 1534 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 71 × 49 = 3479 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 54 × 35 = 1890 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 53 = 742 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 558 + 675 = 1233 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 544 + 908 = 1452 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 81 × 42 = 3402 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 323 + 508 = 823 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 58 × 34 = 1968 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 23 × 63 = 1442 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 51 × 91 = 4641 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 135 + 922 = 1055 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 524 + 214 = 741 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 587 + 252 = 839 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 225 + 382 = 602 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 704 + 130 = 834 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 126 + 868 = 994 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 395 + 350 = 754 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 906 + 228 = 1134 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 27 × 82 = 2214 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 366 + 388 = 747 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 17 × 27 = 459 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 86 × 70 = 6020 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 81 × 33 = 2673 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 58 × 21 = 1218 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 376 + 605 = 981 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 13 × 40 = 520 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 838 + 658 = 1496 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 808 + 818 = 1623 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 750 + 272 = 1015 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 97 × 59 = 5722 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 64 × 23 = 1472 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 241 + 156 = 398 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 58 × 67 = 3886 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 32 × 14 = 448 right or wrong? (a) Right (b) Wrong

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