Click on Equation at the top right corner. You can create formulas in Word to perform simple arithmetic calculations such as addition subtraction multiplication or division. If the cell is not empty delete its contents.
How to Make a Form in Word for a Combo Box.
Just switch to Insert tab and click Equation Insert New Equation to toggle on Equation Tools. If you see Microsoft Equation 30 or Math Type in the Objects list select it to insert an equation. This will display a Formula Dialog Box which will suggest a default formula which is SUMLEFT in our case. Now you can type in and then select a simple equation do not select the equals sign in your Word document and click the Formula button.