On the Start menu point to Settings and then click Control Panel. Select the table cell where you want your result. To do this click inside the last cell in the fourth column click on Layout in the ribbon and then click on Formula at the far right.
Put the cursor in the cell that will hold the sum or product of the cells above below to the right or to the left.
Click OK to accept the change. After you insert the equation the Equation Tools Design tab opens with symbols and structures that can be added to your. Click on Equation at the top right corner. To obtain the math environment click on Equation on the Insert ribbon on Windows or Word for Mac 16 or in Document Elements on Word for Mac 11.