Solving a Part-Part-Whole Problem with Child 39

This child uses cubes to model a part-part-whole problem where the whole is unknown. He uses a counting all strategy. He counts out each part and then counts them altogether, starting from one.

Focus on the Child videos are taken from one-on-one interviews with individual children. The interviews are designed to elicit evidence of children’s mathematical thinking. They are not teaching episodes or formal assessments.