This site has everything for the K-6 reader including ebooks, read alongs, games and puzzles.  There is something for every reader here.  Check it out!

TumbleMath has math picture book lessons for every age from K-6.

TumbleMath is the most comprehensive collection of math picture books you will find anywhere. All in the amazing TumbleBook format complete with animation and narration.

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The books are accompanied by supplementary materials including lesson plans and quizzes.