<metaname="description"content="The SUM function is one of the math and trigonometry functions. Learn how to use the SUM formula in Excel sheets and compatible files with ONLYOFFICE. "/>
<p>The <b>SUM</b> function is one of the math and trigonometry functions. It is used to add all the numbers in the selected range of cells and return the result.</p>
<li>click the <b>Insert function</b><divclass ="icon icon-insertfunction"></div> icon situated at the top toolbar,
<br/>or right-click within a selected cell and select the <b>Insert Function</b> option from the menu, or click the <divclass ="icon icon-function"></div> icon situated at the formula bar and select the <b>SUM</b> function of the <b>Math and trigonometry</b> function group,</li>