This free website will teach them through videos and then practicing the concepts everything there is to know in math.
All you do is go on the website http://www.khanacademy.org and sign up. This website not only teaches them math but allows them to earn points (based on how long they work) to change their avatars and the people who run the site will send you updates on how long your child has worked on the site and their progress. Love, Love, Love this site.
THIS IS A GREAT HOMESCHOOL HELP!