HUB1411 This unique 24" inflatable ball provides an excellent way for children to practice math facts and concepts through play. Also great for organized classroom activity! 99 facts are included, all single digit numbers, with some pictures, encircle the exterior of the ball. Non-English speaking children and non-readers can successfully participate, because word problems are in picture format. Two or more players toss the ball to each other, answering problems shown under their left thumb. Can be used on the playground, in the classroom, or at home.