Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 261 · 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 375 + 268 = 643 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 353 + 292 = 645 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 28 × 91 = 2548 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 580 + 799 = 1379 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 34 × 92 = 3128 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 67 × 49 = 3283 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 221 + 561 = 782 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 319 + 132 = 451 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 27 × 45 = 1208 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 807 + 105 = 914 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 26 × 64 = 1664 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 796 + 839 = 1637 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 27 × 53 = 1431 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 17 × 17 = 289 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 311 + 766 = 1077 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 25 × 24 = 600 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 727 + 889 = 1616 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 62 × 15 = 935 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 20 × 19 = 380 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 77 × 72 = 5544 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 829 + 715 = 1544 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 48 × 14 = 672 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 63 × 45 = 2835 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 20 × 39 = 780 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 38 × 63 = 2392 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 31 × 52 = 1612 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 73 × 13 = 957 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 299 + 888 = 1187 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 773 + 475 = 1248 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 46 × 44 = 2017 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 23 × 37 = 851 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 48 × 22 = 1056 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 372 + 243 = 618 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 642 + 218 = 860 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 90 × 44 = 3960 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 807 + 675 = 1482 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 68 × 27 = 1836 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 19 × 33 = 627 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 32 × 24 = 768 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 600 + 793 = 1396 right or wrong? (a) Right (b) Wrong

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