Math Keyboards help kids develop basic math skills with these handy, portable, plastic boards. Each of the 81 keys has a math equation on it, just press it down to reveal the answers! Practice addition and subtraction with this portable keyboard. Details: Multicolor 1 keyboard with 81 keys Help kids develop basic math skills with this handy, portable, plastic boardPush the button down and the correct answer magically appears through the tinted plastic The addition problems are printed on white buttons and the subtraction problems on pink