Background: The number block is a media that Montessori created in 1909. This block media is made of a wooden square and consists of 10 blocks with red and blue colors. Each red and blue segment represents the sum of 1 block. https://miabellesbabyes.shop/product-category/me-valentines-pajama/
The Influence of Playing with Number Blocks on the Increase in Counting Ability in Class 4 Mental Retardation Children in SDLB/C Aditama Surabaya
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