Hint: when creating an assignment, enter a due date much past your expected due date on the assignment because assignment closes on the due date and you can not add anymore data.  This means to add grades after the due date,  you have to delete the assignment and recreate a copy of the assignment and reenter all the grades.
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Quick Review on how to create assignments and add grades.   745k v. 3 Apr 27, 2010, 3:09 PM Unknown user
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Summary of Teacher Tools for SIS  7k v. 2 Sep 22, 2009, 3:29 AM Frank Hardart