The Influence of Playing with Number Blocks on the Increase in Counting Ability in Class 4 Mental Retardation Children in SDLB/C Aditama Surabaya
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.According to Fridani in Kompas Daily (2010), the block game itself has several advantages, including that children can recogniz