The purpose of this study is to clarify children's sense to understand the concept of quantity in terms of their language and peer-relationships. A specific circumstance in which 3-4 year old children used words related to quantity was recorded and changes of their lives were analyzed. First, the result shows that the interaction between division of viewpoints related to quantity and acquisition of language related to quantity formed the concept of quantity. Second, changes of peer-relationships and their play activities changed necessary viewpoints related to quantity. Third, from the point of relation between language and peerrelationship, expansion of verbal expression helped to share the purpose of their play activities.
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