This is a great site to solve basic mathematics, algebra, trigonometry, pre-calculus, calculus problems.

This is a search engine, mainly used in math and science to find the results of any type of mathematical problem.

This is a fantastic tool created for students and teachers which helps to follow students' improvements and reviews different subjects and topics through flashcards, tests, group and individual work. I have used it with my ESL students when targeting vocabulary.

This site has free online books for different age levels. It also has a lot of good non-fiction books as well. The cool thing is you can let your kids read these for free and the organization donates books to children that do not have any. All you have to do is set up an account and let your children read! It is completely FREE!! The more books people read online, the more they donate to other children. Spread the joy of reading!!