Twenty Tray:

This tray comes with blocks to make a stair from 1 through 20.  It helps children recognize the underlying structure of our base 10 system and is particularly good at helping children to understand the teen numbers.

The Stern Structural Arithmetic materials are made by

R.L.Palmer in Kamloops, British Columbia, Canada and Maple Landmark Inc. in Middlebury, Vermont, U.S.A.

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