Excel - simple subtraction -

[MzWilli1223]

I am basically new to Excel, so bare with me.  SUM totals work fine.  Subtractions are not working.

At top of C4 I have the total quantity of 200.  periodically a  number should be subtracted so I have a TOTAL at bottom of column (say C25) that shows a balance of 87 because of the numbers I am inputting should be subtracting not adding.

Just need this subtraction to work for a single, simple column, not the whole sheet.

Taking a class real soon - but need to get this simple formula working asap.

[#2]

Are the numbers in the column that need to be subtracted negative?

[#3]

@Tim18283848585 

I did not make them negative, but yes....they are all supposed to be subtracted from the beginning number of 200.

total showing on line C25 should reflect 87