How does extra credit work in Gradebook?
The extra credit (EC) feature in Gradebook can be enabled (1) at the item level or (2) at the category level. For more information on adding items/categories to the gradebook see How do I set up my Gradebook? or How do I add items to the Gradebook?
When you designate an item or a category as EC, those items are not added to the total "out of" value for points possible. If students earn points for extra credit items, those points are added on top of the total grade. However, no points will be deducted for students who do not receive a score for extra credit. EC indicates "bonus" items, or optional credit.
Note: It is important that you DO NOT make individual items extra credit within an extra credit category. Those items will be considered optional within the category and therefore would have no effect on the overall grade outside of the category.
Go to Gradebook.
Select the Gradebook tool from the Tool Menu of your site.
Setting EC at the item level.
Click Edit Item Details.
Check the box next to Extra Credit and click Save Changes.
Setting EC at the category level.
Extra credit item.
Individual extra credit items can be added to any category, or to a gradebook that contains no categories.
Example: EC item in gradebook with no categories.
Let's say you have a gradebook without categories. This gradebook contains 5 quizzes, 4 of them are for credit and 1 of them is an extra credit quiz. The extra credit item will display a plus icon in the column header to indicate that it is an extra credit item.
Quizzes are worth 10 points each. The total points possible for the scenario above would be 40 points possible (i.e. 4 quizzes at 10 points each). The EC quiz does not factor into the total "out of" points possible, so the total points remain at 40.
If a student were to score 10/10 points on all 5 quizzes, that student would have a course grade of 50/40 points, or 125%. The 10 points for the extra credit quiz are added on top of the total points for the other items.
Note: If a student scores 10/10 points on only 4 of the 5 quizzes, skipping either the EC quiz or one of the other quiz items, that student would have a course grade of 40/40, or 100%. The EC item can "replace" or make up for another score if it is worth the same amount of points.
Example: EC items within weighted categories.
Things get a little more complicated when you have weighted categories. You can still specify individual items as extra credit within weighted categories, but the overall percentage grade is not a straight-forward points calculation. Instead, all of the items within each category are averaged together, and then each category average is weighted by the designated amount.
For example, if you have 3 regular assignments and 1 EC assignment in an "Assignments" category that is worth 40% of the total grade, the points for all 4 items (e.g. 40 points) will be added together and then divided by 30 (the total points possible) to result in a category percentage of 133%. Then, 133% will be weighted as 40% of the course grade, which along with other extra credit items, results in a course grade that is higher than 100%.
Extra credit category.
Now, let's say that you want to create an extra category rather than an extra credit item. This can be useful if your gradebook includes weighting, or if you have several EC items that you want to group together into a category.
Example: EC category only.
In this example, there are categories only (no weighting) in the gradebook and one of the categories has been designated as extra credit. Any items placed into the EC category are automatically omitted from the total points possible for the course grade; however, any points earned for those items are still added to the total.
Therefore, if you have 3 items worth 10 points each in the EC category, and a student earns 10/10 points for all three of them, in addition to a perfect score on all other items in the other categories, the student would have 130/100 points possible, or 130%.
Example: EC with weighted categories.
Now let's look at an example of weighted categories with extra credit. Notice that when you set up weighted categories in the gradebook, your combined category weighting must equal 100%. However, by designating a category as EC, you can have a sum that is greater than 100%. In this example, Assignments (40%) + Discussions (10%) + Quizzes (50%) = 100% of the course grade. The extra credit category is worth 5% of the course grade in addition to the 100% total. Including EC, a student could potentially earn 105% of the total grade.
Notice that, while none of the scores have changed from the prior example, the course grade percentage is now 105%, instead of 130%. This is due to the change in the weighting of the categories. The EC category has a maximum of 5% on top of the total grade (provided that you do not award more than the maximum number of points per item).