Blank Cells and Zeroes

I am a teacher trying to use an iPad with iOS Numbers as a mobile gradebook.
One issue I have is making a blank cell not count in sums and averages. When I enter a new assignment, the student automatically gets a zero until I enter his or her actual grade, which negatively and unfairly affects his or her averages.
Is there a way to skip a blank cell in sums and averages instead of having it automatically count as a zero?
I also have Numbers on a laptop (if that helps).

When I tried this using the Gradebook Template, I found that if I added a new work item to be graded (quiz, exam, assignment, etc) as a new column (adjusting the weight to keep the semester/term total equal to 100% of the grade) that the new column is blank until I enter something, even if the cell is formatted for numbers. So that worked as planned.
There is another way, of course to keep the grade from being recorded as zero - use a pull-down (pop-up menu in the cell - you can set the first line in the menu to read "Petunia", "new item", "ungraded" or anything you wish and then build the pop-up list to match your grading needs (e.g., 100%, 99%, 98%, ... or A, B, C or A+, A, A-, B+, B, B-, or 4.0, 3.75, 3.5, 3.25, etc... you get my drift) Sounds tedious BUT you only have to build it once and then copy/paste and match style for all the rest. So here you can create a new column, paste in the pop-up menu cell you've carefully created elsewhere, fill-down and you are ready to go (just remember to adjust the weighting to stay fair.) Someone writes a stellar paper, pull-down to the grade you think it deserves, move on to the next, etc.
On the iPad (iOS Numbers) the formatting is: Select the cell > Styles Menu (brush) > Format > Pop-Up Menu > (enter your desired list) > Initial Value = Blank or First Item.
Works for me.  Try it.
Hope this helps.

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