Great youtube videos--and a lot of them perfect for Kinder through about 7th. Makemegeniusyoutube channel. On their main website, they have quizzes and test for the older grade videos, and educational powerpoints and much more!
If you haven't visited Khan Academy--please do! Notice they now have math for younger grades, history, humanities and science. I've included a screen shot so you can see the subjects now offered. Have your child sign up, they can keep track of their progress this way.