These are some of my favorite math websites. For "Math is Fun," I find it best to type "math is fun" with the concept that you are searching (e.g., "math is fun quadratics").

http://www.mathsisfun.com/links/curriculum-algebra-1.html

http://my.hrw.com (each student has been assigned a user name and password)

https://www.khanacademy.org

http://www.regentsprep.org/Regents/math/ALGEBRA/math-ALGEBRA.htm

http://mathbitsnotebook.com/Algebra1/Algebra1.html

http://www.mathsisfun.com/links/curriculum-algebra-1.html

http://my.hrw.com (each student has been assigned a user name and password)

https://www.khanacademy.org

http://www.regentsprep.org/Regents/math/ALGEBRA/math-ALGEBRA.htm

http://mathbitsnotebook.com/Algebra1/Algebra1.html