Hi there! I am happy to help you with this! All you have to do is multiply like you usually would and insert the decimals in based on how many digits are behind the decimal on the numbers you are multiplying. Here are the answers to help you out.
1. 447.3
2. 441.2256
3. 443.886
4. 205.92
5. 154.825
6. 70.364
7. 131.3312
8. 126.82
9. 142.128
10. 224.28
11. 23.01
12. 34.72