@adessler If the test is a paper copy handed out to students, then you can just make the assignment worth 100 points and enter in up to 104 for the score.
If you are using speed grader on a canvas quiz, then @edenos is correct - set up the quiz for 100 points and depending on where the extra credit comes from will determine how to make the change. Add fudge points if that is possible. Or, if it is individual questions - just assign those questions to be worth 0 points. Then in the question state that it is worth the extra credit point value.
If you are using a rubric with an assignment, make the rubric worth the 104 points, but assign 100 points to the assignment - you will be given a warning on the rubric that the grade discrepancy exists, but you can tell it to keep them different - I do this on my homework assignments.
Any other combination I am not sure about. It really depends on how you are putting the test into Canvas and how you want to assign the extra points.
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