Objective: See and describe numbers of objects using 1 more within 5-group configurations.
In Lesson 3, students see and describe 1 more as + 1. They use the structure of the first addend rather than its cardinality: The number is a unit to which they can add one, or count on by one, without recounting. Students now stand on this first embedded number, which lays the foundation for the Level 2 strategy of counting on.
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