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- Building sets of 19 and 20
- In this lesson, one of a seven-part unit from Illuminations titled “Let's Count to 20,” students explore sets of 19 and 20. They count up to 20, construct and decompose sets up to 20, and record the decompositions. (Learn more)
- Format: lesson plan (grade K–2 Mathematics)
- Provided by: Illuminations

