On the Table Tools Layout tab in the Data group click Formula. Depending on the size of your screen you may have to click the Data button first. Then press the Shift F9 keys on your keyboard.
We will use these to add formulas.
View Formulas in a Table in Word Instructions. Instructions on How to Insert Table Formulas in Word To insert table formulas in Word click into the table cell where you want to show the answer to the formula. You insert a Text Form Field control into each cell where you want users to input or modify values. To switch between viewing an individual cells formula versus its result select the formula within the table cell.