On the ribbon go to Formulas. You can type in the Formula box select a number. On the Layout tab under Table Tools click Formula.
On the ribbon go to Formulas.
This will bring up the Formula dialog with a default of SUM LEFT. How to Type and Use Mathematical Equations in Word 2016. Select Logical to open the function dropdown list. Instead of having to write out the formula as SUM D2D10 we can simply enter in SUM Friday then hit Enter.