IXL is an online resource that contains many math practice activities aligned to Common Core standards. Teachers can assign specific standards for students to practice, and students can also practice at home. Khan Academy provides hundreds of math tutorials from kindergarten through college, along with practice problems and hints. It is useful for homework help and for parents helping their children learn. Smart Exchange allows teachers to share and modify Smartboard lessons. Shared files can be customized for different classes. Smartboard activities benefit students with disabilities by enabling direct interaction. Math Goodies is an online notebook for students with built-in interactive practice problems. It contains visual examples and is suitable for students who have difficulty copying from the board.