Hopefully you will find the following helpful for extra handouts, homeschooling handouts , or summer school worksheets.
www.funmaths.com lists printable worksheets for high school level math classes, --a widevariety of printables including trigonometry, algebra, geometry, and statistics
Check out Mr. Hoffman's free math worksheets
www.math.com has a free algebra worksheet creator
www.mathworksheetscenter.com has a few free worksheets, nearly all grade levels of math ---and lots of additional worksheets for paying members
Math Worksheets with Solutions! covers basic math, algebra, trigonometry, calculus and more (including complete exams)
At the Math Fact Cafe you can generate your own printable worksheets for extra practice.
Find High School Math Material for Algebra and Geometry created by a retired math teacher...great practice for summer school work.