Funbrain

FunBrain is an educational website created for students in Kindergarten through 8th grade.  The website is comprised of free interactive games, books, and videos that help kids develop skills in math, reading, problem-solving, and literacy.  FunBrain has every video and game categorized by subject and grade level, which makes finding the appropriate game for your grade and subject so much easier.  This website has several educational games, such as the game Change Maker, where you have to use basic math skills to count out how much change is due during a transaction, as well as how much of even denomination of money should be given to warrant the least amount of coins or bills.  The service is 100% free and does not require creating an account.