How to subtract numbers in OpenOffice Spreadsheet?
To subtract two or more numbers in a spreadsheet,
Step 1: First click on the cell where you want the answer to be given.
Step 2: Type = and click on the required cell reference and separate it with the minus symbol.
Step 3: Press the Enter key on the keyboard.
Example: If you want to subtract the value "1045" which is in cell A2 and "343" which is in cell A6, then you have to give it as =A2-A6