Here's how you can close multiple apps at the same time in iOS 7.
1. Press the home button twice to open the multitasking screen.
2. Use two or three fingers (depending on how many apps you want to close) to tap on the apps you want to close, hold then swipe up and release.
This is a quick and easy way to close down more than one app at a time in iOS 7.
Read more: iGeeks