One that my kids love and have loved since they were little is Starfall.com. It used to all be free and those things are still free but they have also expanded and made a larger section that you can access with subscription. My kids favorites this time of year is putting the face on the pumpkin.
The next one is Sightwords.com. They are a bit newer but is a great site packed with information on getting your child to read and a smaller section on math.
There are free and printable materials designed to promote learning in the classroom and at home. The site's features include:
• A Curriculum covering the full range of Phonological and Phonemic Awareness
• Classroom-tested Lessons based on the latest research, complete with “how-to” videos
• Printable picture cards, word lists, and game boards
• Teaching Tips for tailoring games to the specific needs of your students
I haven't used it a ton, but there is a wealth of information on there. My four year old is sure to benefit from this!
Till next time...