Basically if you assign point values that vary from 5 pts to 100 pts for assignments and they assignments are not weighted, this is the calculation method you want

 

2. Total Points with Weight - The students’ cumulative grade is based on the total points earned, divided by the total points attempted within each assignment type.  The assignment type cumulatives are then averaged together based on their weights.  Select this option if the cumulative grade is based on something like 30% homework, 40% quizzes, and 30% exams, but each assignment within those categories is worth varying points.

 

3. Lastly there is the Percentages method: Assignments are averaged together within each assignment category, the average is used to calculate the cumulative grade based on the weights the teacher has entered.  Select this option if the cumulative grade is based on something like 30% homework, 40% quizzes, and 30% exams, but each assignment within those categories should count equally. It's important to note, if you are choosing to use a Letter Grade Scale with this calculation method, to check with your administrator to ensure the scale has a max value of 100 pts.