The Toss N´ Talk Math Machine Series interactive ball is an excellent way for math students to have fun while they learn. They can use it at home or in the classroom for a fun and simple way to practice math concepts. It´s an impact-activated ball that talks when kids catch it. When it´s caught, a math function is randomly called out and the student must perform the function on the numbers found under their thumbs. This 24" inflatable ball has a battery included as well. READ RELATED MOM REVIEW