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Here is a tutorial on how to add or edit points for an Assignment.
You can add or edit the amount of points on a given assignment.
Note: When an assignment is set as a moderated assignment, only the moderator or a Canvas admin can edit the assignment after it is published.
Open Assignments
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In Course Navigation, click the Assignments link.
Edit Assignment
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Click the assignment's Options icon [1] then click the Edit link [2].
Edit Points
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Edit the points available for the assignment by typing in the points field.
Save Assignment
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Click the Save button.