answer:Each is seen as a separate site to Google, so your results will be split as will your page rank and total pages. You may also run into some problems with Google seeing some of your content as duplicate, although I think this is less of a problem than in the past within the same domain. Either way, better to fix it if you’d like people to find you via search. Does your host allow you to upload an .htaccess file? You could easily redirect all other subdomains to just use www.mathed.org (unless you have some subdomains you’re actually using for separate content) or no subdomain at all, whichever you prefer. This was be the easiest and most comprehensive way to solve the problem. Here’s a discussion that seems to fit your scenario and includes a solution. And here’s an htaccess primer for some background if you’re interested (you may already be familiar, but never hurts to throw it in). I hope it helps.