This article will be used by teachers who wish to know why some student's grades drop for some when extra credit assignments are added.
This happens when the special extra credit feature with weighting is in use. Adding a new extra credit assignment will change the total points possible in the extra credit category and could lower the student’s percentage in that category.
Example: The extra credit category is set to give a student a 5% boost in their grade. So far the student has scored 10/10 on the one extra credit assignment giving them 100% in the extra credit category and therefore boosting their grade the full 5% or 5 points. Now the teacher assigns another extra credit assignment worth 20 points and the student earns 5/20. The student's total for the extra credit category is now 15/30 or 50% of the 5%; her boost has now gone down to 2.5% or 2.5 points.