If the cell is not empty delete its contents. A Type equation here box opens with a basic sample formula inserted Note that the purple Equation Tools tab also opens. To insert table formulas in Word click into the table cell where you want to show the answer to the formula.
Finally finish your equation.
Select Insert Tab to Type and Use Mathematical Equations To go to the first step start opening your Ms. Just switch to Insert tab and click Equation Insert New Equation to toggle on Equation Tools. You got some nice equilibrium arrows. Position the cursor where you want to paste a formula.