Saw these style boards on Oriental Trading for use as geometry boards. Wondered a diy hack. Use glue on bottom circle of thumbtack to secure it from being plucked out by little fingers. Sowdering About in Seattle: Toddler Busy Boxes
Pin Works on building number sense by counting using correspondence and matching number of objects with a printed numeral. Also works on fine motor skills. Students pick a number card then use tongs to count out that number of pumpkin seeds.