Convert from hex string to decimal the numbers of a pem file

I am using the following command to view the contents of a private key file:

openssl rsa -in mykey.key -text -inform PEM -noout  

I see various sections such as:

modulus:
    00:b9:cd:e6:d2:d5:e8:f1:44:2f:17:c0:89:8b:d0:
    b2:ef:9f:34:5b:17:ca:bc:51:d8:67:71:74:e9:48:
    75:f6:cf:5c:e7:54:7f:c7:2e:0a:54:c3:74:b5:7f:   

How is this number converted to decimal? Is it from left to write appending the corresponding hex byte or some other way?