Description
Students reason about situations to determine if they are decomposing a teen number as 10 ones and some ones, or composing 10 ones and some ones to find a teen number. They analyze the number sentences that best represent each situation.
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Credits
From EngageNY.org of the New York State Education Department. Kindergarten Mathematics Module 5, Topic E, Lesson 23.
Available from engageny.org/resource/kindergarten-mathematics-module-5-topic-e-lesson-23; accessed 2015-05-29.
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