Khan Academy and IXL.com have domain and range finding practice math problems. Intmath.com also provides examples that allow users to practice finding the domain and range of various graphs.
Khan Academy, an educational website founded by Sal Khan and centered around providing free mathematics education, has domain and range identifying exercises. Khan Academy also has numerous tutorial videos on how to find the domain and range of a function from its graph. IXL, an education technology company, has free domain and range related math examples on its website and allows users to keep track of their educational growth. IXL's SmartScore allows students to measure their progress in a particular subject. In addition to practice problems, Intmath.com details the methods used to find the domain and range of a function.