Unit 7
Adding and Subtracting within 1,000
Unit Goals
Unit Narrative
In this unit, students add and subtract within 1,000, with and without composing and decomposing a base-ten unit.
Previously, students added and subtracted within 100, using methods such as counting on, counting back, and composing or decomposing a ten. Here, they apply the methods they know and their understanding of place value and three-digit numbers to find sums and differences within 1,000.
Initially, students add and subtract, without composing or decomposing a ten or a hundred. Instead, they rely on methods based on the relationship between addition and subtraction and...
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