Khan Academy is a great and simple math website for kids. It offers video tutorials for how to do math and eliminates a lot of the cartoony extra stuff. It was featured on 60 minutes tonight! '
I started using it with a few kids about a year ago and it really helped them with their basic facts. You need to have a gmail or facebook account (to ensure you are a real person and not just an advertiser). As a parent you can sign up to be the "coach" and watch your child's progress. You can have multiple students/kids under your name so your whole family can be involved. Check it you and if you have questions let me know and I will answer what I can. Above is the link to the website, below is a link to the 60 minutes excerpt.
And the best part is, it's 100% free!! I also have an account so if you would like your student to add me as the coach my user name is my email: firstname.lastname@example.org.