1 EUREKA MATH2
LESSON 1
Organize, count, and represent a collection of objects. 3 ▸ M1 ▸ TA ▸ Lesson 1
Name
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1. What unit did you use to count your collection? Explain why you chose that unit. Sample: I chose fives. Counting by fives is quick. I found the total using fewer counts than I would have if I had counted by ones.
Lesson at a Glance This student-driven lesson provides an opportunity to gather formative assessment data as students work with counting collections. Students decide how to organize, count, and represent the items. They analyze the work of others and discuss efficient strategies as a class. There is no Problem Set for this lesson. Instead, use classroom observations and student work to analyze student thinking after the lesson. The Exit Ticket for this lesson serves as an opportunity for students to reflect on their counting strategies.
Key Question • How can we use groups to help us organize? 2. If you counted your collection again, would you choose the same unit? Explain.
Achievement Descriptor
Sample: I would use a different unit. I would use tens because I could find the total using fewer counts than I used when I counted by fives.
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This lesson is foundational to the work of grade 3 and builds from 2.NBT.A.2. Its content is intended to serve as a formative assessment and is therefore not included on summative assessments in grade 3.
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