Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 69 · 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 19 × 91 = 1738 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 14 × 47 = 658 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 15 × 81 = 1215 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 87 × 73 = 6355 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 23 × 19 = 437 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 53 × 81 = 4297 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 85 × 26 = 2210 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 400 + 474 = 874 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 57 × 56 = 3192 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 15 × 92 = 1380 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 464 + 605 = 1069 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 82 × 73 = 5986 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 85 × 37 = 3145 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 343 + 555 = 898 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 59 × 13 = 767 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 163 + 703 = 871 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 344 + 167 = 516 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 73 × 58 = 4241 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 469 + 575 = 1044 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 55 × 90 = 4953 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 83 × 91 = 7553 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 99 × 43 = 4258 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 366 + 694 = 1060 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 666 + 367 = 1038 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 952 + 579 = 1531 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 20 × 16 = 320 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 30 × 26 = 780 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 28 × 60 = 1689 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 956 + 831 = 1779 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 919 + 696 = 1615 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 867 + 483 = 1356 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 49 × 90 = 4410 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 58 × 58 = 3364 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 12 × 12 = 144 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 17 × 60 = 1020 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 38 × 47 = 1785 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 890 + 507 = 1397 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 17 × 12 = 204 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 89 × 82 = 7289 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 92 × 96 = 8834 right or wrong? (a) Right (b) Wrong

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