Here’s how i did this:

1 – open your google spreadsheet
2 – File > Publish to web
3 – Click “Start Publishing”
4 – Under “Get a link to the published data” choose in the drop down menu “HTML to embed in a page”
5 – Click in the box with the code and change 500 to 640 and change 300 to 500, then copy the code.

6 – create a new Doc in your Group
7 – click the “HTML” tab to the right hand side
8 – paste the code.
9 – set your tags, and settings, then click save