Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 111 · 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 146 + 696 = 845 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 764 + 478 = 1243 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 61 × 45 = 2741 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 642 + 329 = 973 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 31 × 19 = 584 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 150 + 356 = 506 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 77 × 66 = 5082 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 998 + 253 = 1243 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 76 × 18 = 1368 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 815 + 389 = 1204 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 685 + 191 = 876 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 991 + 424 = 1415 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 95 × 25 = 2375 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 62 × 12 = 744 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 291 + 471 = 762 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 68 × 69 = 4699 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 233 + 813 = 1046 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 773 + 169 = 944 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 607 + 855 = 1462 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 40 = 1480 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 48 × 59 = 2832 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 25 × 19 = 475 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 182 + 709 = 891 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 17 × 53 = 899 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 44 × 75 = 3307 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 887 + 832 = 1719 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 37 × 82 = 3033 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 512 + 230 = 737 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 40 × 41 = 1635 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 91 × 91 = 8276 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 844 + 176 = 1020 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 55 × 59 = 3245 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 409 + 260 = 669 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 419 + 561 = 980 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 636 + 568 = 1204 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 376 + 177 = 552 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 15 × 32 = 481 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 476 + 396 = 872 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 481 + 522 = 1001 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 322 + 445 = 768 right or wrong? (a) Wrong (b) Right

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