The iPhone’s stock Calculator app has gotten a bit of press lately for its swipe-to-delete gesture, but it’s been a longtime workhorse on the iPhone — in fact, it’s been around since the launch of Apple’s very first model in 2007.

Throughout the years, the Calculator’s look and feel has changed somewhat, but its core functionality remains the same: To help you quickly add, subtract, and square up sums and figures.

Here’s how you can use some of the Calculator app’s basic features — and some of its hidden gems.

How to launch the Calculator app

You can access the Calculator app in four different ways on the iPhone: via the Calculator app icon, Siri, Search Bar, or Control Center.