Unit 5, Lesson 23# Reason about and represent situations, decomposing teen numbers into 10 ones and some ones, and composing 10 ones and some ones into a teen number.

EngageNY 60 min(s)Support for English Language Learners

In this lesson, students work to count to tell the number of objects by answering "how many?" questions. They reason about situations to determine if they are decomposing a teen number as 10 ones and some ones, or composing 10 ones and some ones to find a teen number. They analyze the number sentences that best represent each situation.