Small World Toys "The Pluses & The Minuses" (Addition &Subtraction) & "They Keep Multiplying" (Multiplication) Math Keyboards Gift Set Bundle with Exclusive "Matty's Toy Stop" Storage Bag - 2 Pack Gift Set Bundle Includes "The Pluses & The Minuses" (Addition &Subtraction) & "They Keep Multiplying" (Multiplication) Math Keyboards and Exclusive Storage Bag! Math Keyboards: Help kids develop basic math skills with these handy, portable, plastic boards. Each of the 81 keys (per unit) has a math equation on it - press it down to reveal the answers! Practice multiplication, addition and subtraction with these portable keyboards. For Ages 3 and up - Each board measures 9" x 8.5" x 1.25"