In prep we need to know the names and properties of simple 2D shapes. I would ask them to try and work out how many sides, corners and faces the shapes have from memory. We would then in pairs build the 2D shapes in geoboard. One person builds and the other would note the number of bands used (sides) pins used (corners) and faces (fill). They would then swap and repeat the process. The pairs would then report their findings to their peers and debug any errors found.
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