We use Microsoft Office everyday. There are a lot of features that are hidden by default, and we need to manually enable them so that they appear at the toolbox button. One of the example is the calculation feature.
First of all, click the “Customize Quick Access Toolbar” button and choose “More Commands…”
After that, select the Calculate from the list and press the “Add>>” button.
Then, you may start to provide some formula, highlight it and press the “Formula” button at the Quick Access Toolbar. Microsoft Word will calculate the result and save at clipboard. Then, press the “Paste” button and the result will appear.