You can also reference individual cells like writing SUMA1 A2 A3 which will give you the same result. Select Insert Tab to Type and Use Mathematical Equations To go to the first step start opening your Ms. Formula with Text in Excel.
One of them is Equations and the second one is Symbols.
To insert table formulas in Word click into the table cell where you want to show the answer to the formula. Formula with Text in Excel. You can select portions of the equation and edit them as you go and use the preview box to make sure Word is correctly interpreting your handwriting. All the necessary templates to write math equations are available in Elements.