Use the following websites to help reinforce what your child is learning in school.
www.abcmouse.com
www.starfall.com
www.abcya.com
www.softschool.com
www.coolmath-games.com
www.sesamestreet.org
www.funbrain.com
Free Educational Apps for Kinderkids :D
IXL ...sign in as a guest (20 free questions a day)
Splash Math Kindergarten (20 free questions a day)
This is a great App and well worth the money if purchased!
Math UP K
Great for beginning addition and subtraction
Lola's Panda Party
There are several Lola APPs that the kids seem to like
Sorting Machine
Teach Me: Kindergarten
Math Blasters