Measurement Inquiry - For CAP classrooms, this could double in the discovery center with a graph (children put their name under the color they think has the most)-- Use non-breakable PLASTIC jars and hot glue the lids on.
Another pinner: Measurement -- Longer/Shorter. Easy for my five year old but good practice for her to work independently. Was surprised my two year old sorted and match the lines on her own the way they are in the picture. Super easy to put together.