1) Press the Home button twice and the App's currently running will come up.
2)Then press and hold any app showing and they will start shaking with an on top left.
3) Press to end the particular app or app's you want to stop..
Thanks so much kitiecarson for the steps!
Linda, that's a great question! You want to make sure to close applications often to save battery life. Make sure that on step one you are double tapping the Home button quickly. Here's more step by step instructions from Apple. http://bit.ly/TomdWF
Let me know if you need further assistance.
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It appears there is no other way to close an app when you are finished with it. Do the apps in the background remain open and using battery life? Or are they inactive? Thanks for the info.