Mathematicians in Room 123 recently began exploring teen numbers, focusing on different models to represent the ten and the ones. As they worked with these models, they gained fluency with adding ones to a ten.
Then, students used their understanding of teen numbers to learn a new addition strategy: Make a Ten. This new strategy is a more efficient one to use when adding larger numbers. Students used either a bead string or an open number line when they apply this strategy.
Mathematicians compared the two models, noting important similarities and differences.
To develop a deeper understanding of teen numbers as well as fluency with teen addition, students often play a teen number matching game.
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