These are some books that my eight-year-old loves! His favorite mathy book is The Number Devil, which he loves to hear at bedtime. We also use khanacademy.org and loved the Sir Cumference series when he was younger.


Amazing Math Projects you can Build is great for kids who enjoy building things.

http://www.horrible-science.co.uk/books
You can also find these on amazon; they are super-interesting science books written for kids with a gruesome touch. Some of them discuss gory topics so preview if you're squeamish.

http://www.amazon.com/The-Museum-Mysteries-Maths-Quest/dp/1609920864
There is a whole series of these books best found by googling the author. My son loves them and they are very interactive.

The Art of Problem Solving Beast Academy books are done in a comic book format and are quite entertaining.

Hope that's helpful to you! :-)