Racks and Tubes, The Test Tubes - they may go by different names, but they’re all the same: a gloriously detailed Montessori division material. Introduced to the child somewhere around the end of Lower Primary (6-9 Years) or beginning of Upper Primary (9-12 Years), the tiny parts are appealing. Adults who have had an opportunity to see the Racks and Tubes used are usually delighted by the way this physical...
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