First, you’ll need to create a Google account at: https://www.google.com/accounts/NewAccount. This will allow you to use Google’s advanced and password protected services, including Google Docs. You’ll need to enter your Hotmail address and a password and then go through a couple of simple steps to create your account.
When you’ve done this, go to the Learning 2.0 Google spreadsheet at http://spreadsheets.google.comccc?key=0Ap0bjTFIs4PxdHFBV1FhMnJzdlNrMHZGbnZwYnJITHc&hl=en. There’s a sheet for each group; look for the tabs at the bottom of the screen:

For each group, there is a set of questions; the answer to each sum is used in the following question. You can divide the questions up between the people in your group, or work on them together – it’s up to you. The spreadsheet works like a standard Excel file – all you need to do is type the answers in the boxes provided. The sheet auto-saves, so don’t worry about saving anything.
Once you’ve got all the answers, the final number should be something with some significance. When you’ve worked out what this number represents, post the answer on you blogs. Once you’ve done that, you could have a look at how the versioning works in Google Docs – find out how here: http://www.screencast.com/users/joshhomme/folders/Jing/media/c7c775a5-06a1-4d67-86bd-aa2819a48ede.