Yes you can delete them but it might be good to setup a free offline cloud storage acct like Box.net (my fav) or dropbox. This is important if you want to save key apps that you rely on and if there is an update and has a major bug you can always reinstall a lower non buggy version. Or for apps you bought (paid for) from a non amazon site (since amazon does keep your apps in the cloud). They do take up space. If you use an app like Sandisk Memory Zone or Android Assistant or ES file explorer, you can find all the apks hidden on your phone/tablet and sort them by size and then delete them
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