Why do Montessori classrooms have mixed age groups in one class?

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Children learn from each other. Young children learn higher level cognitive and social skills in part by observing other children as models. In a mixed aged Montessori classroom, children's collaborative skills and cooperation are cultivated because older children act as role models and teachers of younger children. Older children reach a deeper level of understanding when explaining concepts to a younger child. Multi-age groupings help children develop a sense of community as well as foster social development.