Unit 5
Composing and Decomposing Numbers to 10
Unit Goals
Unit Narrative
In this unit, students explore different ways to compose and decompose numbers within 10 and to represent the compositions and decompositions.
Previously, students counted and compared groups and images of up to 10 objects. Students solved addition and subtraction story problems and wrote expressions to represent the problems. In this unit, students use those experiences to compose and decompose numbers within 10. (The terms “make” or “break apart” are used with students.)
Special attention is given to composing and decomposing 10, as it is the basis of place value in...
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