I've accidentally redirected the output of a CSV file to my directory. How can I `rm` only the files that start with a number, and leave the files that start with a letter intact? 

```
mymachine$ ls
71.24         README.md        30            4.29
8             filter.sh        42.81         5.58         
8.36          purchases.csv    1,208.8       100          
16.7          2.56             21.78         269.96        

```