Quality Montessori Materials for Toddler,
Primary and Elementary Environments.E&O Montessori USA.
US contacts:(905) 313-0530, Fax: (905) 313-0402 firstname.lastname@example.org
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The blue board divided into 100 squares for counting from 1 to 100.
A wooden box with answer chips from 1 to 100, and a wooden control chart.