I can't really tell what I've already assigned and what I haven't...

Hi, carrl -

First, click on your name in the upper right hand corner of the Khan Academy site and then select Teacher Dashboard from the drop down.

Once you are viewing your teacher dashboard, you can click on one of your classes and then click on the Assignments tab from the bar on the left.

Upon clicking the button you should get a drop down with three different viewing options; click the Manage button.

This will pull up a list of all of your past assignments to the class. Switch between viewing your currently assigned assignments and your saved assignments by clicking the blue Active and Saved buttons near the top.

Please let me know if you have any more questions!