Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 280 · 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 213 + 321 = 525 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 616 + 874 = 1486 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 81 × 56 = 4532 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 70 × 17 = 1190 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 464 + 617 = 1081 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 44 × 80 = 3520 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 977 + 818 = 1787 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 862 + 975 = 1846 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 24 × 73 = 1752 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 769 + 776 = 1545 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 158 + 708 = 866 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 774 + 285 = 1059 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 49 × 86 = 4219 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 18 × 26 = 468 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 64 × 27 = 1737 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 31 × 48 = 1484 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 13 = 626 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 270 + 134 = 395 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 190 + 304 = 501 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 492 + 213 = 705 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 46 × 91 = 4186 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 534 + 595 = 1120 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 81 × 97 = 7857 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 25 × 36 = 904 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 77 × 57 = 4392 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 41 × 70 = 2876 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 253 + 941 = 1194 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 336 + 539 = 873 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 355 + 899 = 1254 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 861 + 587 = 1445 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 108 + 634 = 742 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 53 × 88 = 4664 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 75 × 30 = 2243 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 37 × 32 = 1189 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 13 × 43 = 560 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 792 + 495 = 1287 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 443 + 254 = 697 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 897 + 937 = 1826 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 410 + 454 = 864 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 44 × 66 = 2904 right or wrong? (a) Wrong (b) Right

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