Spreadsheets with mathematics?

[Durandir]

Hi.
I am making a website for the local bowling club. They want an easy way to edit their site themselves, and thus I have used CMSms. Had some trouble setting it up properly, mostly because of my total lack of previous experience in website building and coding. This is more me doing my step dad a favor really.
Now, the site has been made, and is working as they want it to. Except for one thing. They need a simple way to edit results. All they should need to do is to edit one number, and the rest calculates itself. As in Microsoft Excel.

Is there an easy way to accomplish this? A module or something?

There are two things they will need:
1. A means for numbers in a spreadsheet to calculate automatically when another number is changed.
2. A way for entries in the spreadsheet to move up or down according to one set of numbers.

I imagine this would need some work with the database and such as well.
One of the things here that are important is that someone with no experience in coding or anything can use it once I have set it up.

Hope someone can help me.