Google Sheets is a versatile spreadsheet app you can use across multiple platforms, including any browser as a web app, on Android or iOS as a mobile app, or even as a desktop app through ChromeOS.

To add a formula in Google Sheets, click the cell where you want the answer, then choose one of the hundreds of functions.

Faith writes guides, how-tos, and roundups on the latest Android games and apps for Android Police. You'll find her writing about the newest free-to-play game to hit Android or discussing her paranoia ...