Then click the Insert tab in the Ribbon. Then click the Equation button in the Symbols button group. If you want to sum a row of a table in a Word document do as follow.
Then click the Equation button in the Symbols button group.
Under Formula Word takes a guess as to the formula you might want to use and displays SUM LEFT. Place the cursor at the blank cell of the first row then click layout Formula see screenshot. If you dont want to find these symbols separately and rather input the formula by handwriting. How to calculate formulas in a Word document 1.