Our magnetic activity cards make math lessons stick! Kids just slide an activity card into our Self-Checking Magnetic Board (sold separately below), then use magnets to answer the questions on the card—counting quantities, sequencing numbers, learning about ten-frames and more. When kids are ready to check their work, they press the button—correct answers stay in place, while incorrect answers fall right off the board! The set contains 6 magnets and 12 double-sided activity cards—for a total of 24 activities. Cards measure 8 1/2" x 11".