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WordPress has its own simple built-in Image Gallery that allows you to add multiple images to a page in one easy step.

To insert an image gallery into your Page/Post, click the Add Media button. A pop-up window will display that looks the same as the one that displays when you add an image to your Page/Post. You can upload new images to use in your gallery or you can simply choose from your previously uploaded images.

By default, you’ll be shown a list of your previously uploaded images. If you’d like to upload a new image, click on the Upload Files link at the top of the pop-up window.
Click the Create Gallery link in the left-hand navigation then select the images that you’d like to insert into your gallery.

Video Tutorial: http://support.rvhobo.net/wordpress/image-galleries
Documentation: http://easywpguide.com/wordpress-manual/adding-images-other-media/insert-an-image-gallery/