How to Determine the SharePoint 2010 Build Number
Here is some information that might come handy while you are working with SharePoint Server 2010.
Farm Build Number
Central Administration -> System Settings -> Manage servers in this farm -> Configuration database version.
You can also use the Windows PowerShell script: (get-spfarm).buildversion
Products Build Number
Central Administration -> Upgrade and Migration -> Upgrade and Patch Management -> Check product and patch installation status.