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Maths tricks trick 22: Last-digit detective · Set 509 · 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 446 + 567 = 1013 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 33 × 26 = 858 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 84 × 13 = 1087 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 486 + 998 = 1476 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 287 + 630 = 917 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 536 + 654 = 1185 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 889 + 602 = 1490 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 27 × 23 = 618 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 91 × 47 = 4277 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 232 + 889 = 1121 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 24 × 96 = 2311 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 54 × 78 = 4210 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 227 + 828 = 1048 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 914 + 224 = 1138 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 899 + 478 = 1383 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 20 × 44 = 880 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 18 × 61 = 1096 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 39 × 29 = 1131 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 50 × 15 = 750 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 53 × 69 = 3648 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 27 × 83 = 2239 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 836 + 359 = 1193 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 91 × 79 = 7189 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 216 + 422 = 638 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 994 + 755 = 1746 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 98 × 47 = 4602 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 49 × 75 = 3675 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 157 + 540 = 701 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 30 × 36 = 1088 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 58 × 58 = 3364 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 80 × 37 = 2960 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 27 × 61 = 1647 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 606 + 325 = 927 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 59 × 30 = 1776 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 70 × 31 = 2167 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 670 + 244 = 917 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 204 + 998 = 1194 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 304 + 373 = 677 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 514 + 826 = 1336 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 775 + 858 = 1633 right or wrong? (a) Wrong (b) Right

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