Small World Toys Preschool – Pluses and the Minuses Math Keyboard

Amazon.com Price:  $17.99 (as of 31/12/2019 07:14 PST- Details)

Help kids develop basic math skills with this handy, portable, plastic board.
The Addition/Subtraction Keyboard contains 81 buttons, each with a single-digit addition or subtraction problem printed on it
Push the button down and the correct answer magically appears through the tinted plastic