Autosum is a predefined command of adding your data. In order to used it just select the cell where you want the total of your data and then select the cell range. Group of cell are highlighted and on pressing Enter key it will show you a result.
In math’s you will learn about Mathematical Operator like –
In excel we use the same but sign of operation will change.
In excel there is an order of operation. There is a sequence of operation excel will follow while calculating a data.