Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.

English/Language Arts
 

Math

• IXL - Practice math skills!
• Figure This! - Math Challenges for Families

Science

• Anatomy Arcade - A good site to learn muscles and bones.
• Updraft Blog - A good site to stay current with weather and climate analysis.

Spanish

• Realidades -->Textbook Site - Level A for Spanish 1, Level B for Spanish 2
• Spanish Spanish --> Vocabulary, games and tests
• Quia --> Games, tests, and grammar activities
• Word Reference --> Great online dictionary