When you type a seven-or-ten-digit phone number into an Excel cell that uses the phone number format, Excel will automatically change the way the number looks so that it appears as a phone number.

You can put a circle around a number in Excel, using the Illustration feature, using Symbol or using the Quick Access Toolbar. Learn how!

You may already know you can add a watermark to a Word document, but you might not know that you can also add a watermark to an Excel sheet. Here's how.