Multiply four digits by one digit

Example: 1,204 × 3 = 3,000 + 600 + 12 = 3,612

1. 1,254 × 2 =
2. 2,023 × 2 =
3. 1,769 × 3 =
4. 1,696 × 2 =
5. 1,220 × 2 =
6. 1,109 × 2 =
7. 3,230 × 2 =
8. 1,373 × 2 =
9. 3,995 × 2 =
10. 4,393 × 2 =
11. 2,440 × 2 =
12. 4,713 × 2 =
13. 6,910 × 4 =
14. 5,833 × 6 =
15. 3,611 × 7 =
16. 1,022 × 6 =
17. 8,013 × 2 =
18. 1,845 × 7 =
19. 1,515 × 8 =
20. 9,447 × 8 =