In Excel for Mac you dont need the parenthesis. Select an empty cell where you want the answer displayed. The answer to the formula displays in the cell into which the formula is entered.
If you want to add substract multiply or divide or do any basic math operation to a excel matrix.
If you want to add substract multiply or divide or do any basic math operation to a excel matrix. Select a range of the same size as the matrix. For example A1B2 would add the items in cells A1 and B2. You can use a short cut to create a blank sheet anytime.