Hooray! “Do Not Open This Math Book” has been named one of Amazon‘s “Best Books” of 2018!! Click here to get your copy of this book that has been a *lifesaver* for parents trying to help their kids (ages 6-8) with addition & subtraction in the new “common core” way it is being taught. Giggle your way through elementary school math with Mr. Mouse, and say goodbye to math homework stress. Makes a great Christmas gift, too. Enjoy!