Why do my photos on my iPhone 4s take up so much storage?

I have 455 items on my camera roll. I have about 80 videos, none go over 2 minutes. The total storage used by my 455 items on my camera roll is 8.83 gb.

How do I fix this problem?

By lowering down some default quality will help to save space.

You can export them to the computer. Or check the iTunes Library if there's a lot of sync-failed files.
Or use the third party app to free up your iPhone storage. http://www.fireebok.com/cleanmyphone.html

720p videos take up space regardless of how small you think they are in terms of time. They would add up overtime of course.

A fix? Clear out the videos/pictures. Could upload them to file storage sites/services
e.g. Facebook, Google+, Flickr, Dropbox, etc

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