This is a virtual game that allows students to practice their knowledge about functions by either finding the input or output of a function. The game also allows students to find the entire function given some information.
Lacoe.Edu

Learning games, educational comics, reading activities, and more.
FunBrain.com

6th grade math knowledge map info
StudyStack

Test how well you know fourthgrade math vocabulary
StudyStack

AAA Math features a comprehensive set of interactive arithmetic lessons. Unlimited practice is available on each topic which allows thorough mastery of the concepts. A wide range of lessons (Kindergarten through Eighth grade level) enables learning or review to occur at each individual's current level.
Immediate feedback prevents practicing and learning incorrect methods, which is a common result of traditional homework and worksheets. Practice can continue as long as desired in a nonthreatening format which helps build selfesteem and confidence.
AAA math

In this video, Salman Khan of Khan Academy explains functions. Part 4 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains functions. Part 3 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains functions. Part 1 of 4.
Khan Academy

This is an interactive lesson about functions and the in and output of them.
NLVM
