Now students can flip, stack and build simple equations! Children just open a flip book and build the equation represented by the ten-frame. Then students stack on new tiles as they flip the pages—changing out numbers until they’ve built all the equations in the book. Kids complete all 3 levels to build 60 different equations! You get 12 flip books, 136 tiles in 3 pouches and a guide with an answer key. Flip books measure 2" x 7 3⁄4".