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By default, only non-empty grades in the Moodle Gradebook are aggregated; the others are ignored. This means that if instructors want students to have an accurate understanding of their progress in a course, a value must be inserted into the points window. If students have not submitted an assignment, instructors need to insert a 0 (rather than leaving the place blank) to affect the final grade. Below is a link that explains how to quickly add zeros for all students who haven’t already received a grade for an activity.