There are lots of Adsense plugins for wordpress and you can use then to add adsense ad boxes to your new posts easily like adding a php tag like <–adsense–> yes its easy than adding the whole code to your posts because it requires time. So what if you have wordpress blog with hundreds of posts currently and now you want to insert adsense ads in to the all current posted ones? Well then it will be harder to edit all of them to add a adsense ad box inside the post. So there is a better wordpress plugin which lets you insert adsense ad boxes to all current published posts and your upcoming posts So you dont need to manually add any php codes.
Plugin name- Easy Adsense
You can install it from wordpress admin panel. If it fails to install and give you a error massage try installing it locally I mean upload the plugin files using FTP to your plugin directory ( The old method for installing wordpress plugins) Then it will work.
You can change the settings to suit your needs. This is for example-
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Best Adsense plugin for wordpress
http://wordpress.org/extend/plugins/adsense-insert/