Here are some good resources that are available for no cost in the areas of Reading and Math.
Reading Tips for Parents–Scholastic.com
Reading Resources – K12 Reader–www.k12reader.com/reading-resources
Free Phonics Worksheets–www.education.com/worksheets
Math.com Parents–Free math lessons and math help from basic math to algebra, geometry and beyond—www.nctm.org/resources/families
Futuristic Math Adventure-Kids 6-12 yrs–FREE–Math Virtual World–www.MathBlaster.com
Hope you find these useful! I will continue to add to the list as I find additional useful websites and resources.