Kids find the volume of rectangular prisms and rectilinear figures—with durable manipulatives that provide tons of hands-on experience! Our kit comes with 160 wooden cubes—plus 20 kid-friendly activity cards. Simply set the kit in your math center and let kids select an activity card…then watch as they uncover volume concepts by building and deconstructing 3-D shapes. Best of all, kids just flip the cards over to check their own answers! Cubes measure 1".