2: Counting From One on Materials - Addition and Subtraction


Four children are playing on the monkey bars. Two more come to play with them. How many children are playing now?

Student: [Puts up four fingers one at a time then two more then counts] One, two, three, four, five, six.

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Students at the Counting From One on Materials stage rely on counting physical materials, like their fingers. They count all the objects in both sets to find an answer to a joining or separating of sets problem.