These FREE cards show models and expressions for area and circumference of circles, fun for Pi Day activities. Kids can match them in math stations or centers, or play four fun games. You may also want to view the "Playing Around with Pi" Bundle that has been featured by TpT. If you want to get kids to discuss math, use games!FEATURES• 40 math cards as nine groups of four cards plus four wild cards• Instructions for four engaging games• A recording worksheet plus answer key• Perfect to use as a