To divide by the sum of cells A1 through A10 by 2 in Excel, use the formula: =SUM(A1:A10)/2. It is also possible to enter numbers directly into the formula.
When entering a formula in Microsoft Excel, it is possible to use "pointing" to select the cells to reference. To "point" at a cell, click on it while editing the formula. Pointing minimizes the risk of referring to the wrong cell in a formula. Excel follows the mathematical order of operations, so it is possible to write more complex equations by using the mathematical operators * for multiplication, / for division, + for addition and - for subtraction.