Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 405 · 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 290 + 490 = 780 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 803 + 702 = 1512 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 910 + 359 = 1260 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 695 + 231 = 925 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 74 × 28 = 2072 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 736 + 619 = 1346 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 72 × 52 = 3744 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 43 × 95 = 4085 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 235 + 408 = 643 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 14 × 37 = 518 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 938 + 848 = 1786 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 33 × 44 = 1452 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 862 + 905 = 1767 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 725 + 388 = 1115 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 26 × 37 = 962 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 928 + 623 = 1551 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 72 × 12 = 864 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 34 × 17 = 578 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 863 + 938 = 1801 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 15 × 17 = 255 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 22 × 30 = 656 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 53 × 20 = 1058 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 90 × 54 = 4860 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 24 × 24 = 584 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 107 + 487 = 597 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 257 + 317 = 582 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 99 × 67 = 6633 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 36 × 37 = 1336 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 43 = 1126 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 960 + 298 = 1258 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 88 × 91 = 8008 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 62 × 23 = 1434 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 484 + 866 = 1344 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 763 + 904 = 1668 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 82 × 72 = 5908 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 19 × 71 = 1349 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 22 × 69 = 1518 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 208 + 369 = 577 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 81 × 30 = 2422 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 889 + 491 = 1379 right or wrong? (a) Wrong (b) Right

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