A 5th grade teaching team I work with recently raised the issue of how to model the problem 1/2 x 3/10 on an array. They saw their students use a variety of models and one teacher got “bothered” by how some of the models felt “imprecise” or “not to scale.” We had a conversation together about this issue. To prepare myself for the conversation I did a little sketching of possible models that kids might use. What do you think?

I am a K-12 math educator, primarily working with teachers and instructional teams in and near New York. In addition, I enjoy writing with and for teachers about current issues of mathematics teaching and learning. Currently I work for Math in the City (City College), with ongoing collaborations with Math for America and The Urban Assembly.
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