Teach R Kids Math is a Web site with a large assortment of interactive lessons that demonstrate basic mathematical concepts. The material ranges from basic counting for preschoolers to more advanced topics for elementary school students. Online worksheets help children practice multiplication and division, rounding, fractions, number sequences, and much more. Some of the activities are timed, which allows the child to see his/her improvement. The site "has been designed by children and adults," making it especially tuned to the most efficient ways of conveying information.