http://www.bbc.co.uk/schools/ks2bitesize/ This is a great site for practicing all types of different 5th grade skills!
www.freerice.com This is a site that allows students to practice math and vocabulary skills. For every question you answer correctly, the site will donate 10 grains of rice to a region in need of food. See if you can get to 10,000!
http://www.brainpop.com/ This site has tutorials, games, and practice for math and language arts skills.