## Reflection: Exit Tickets Area Within An Area - Section 5: Wrap Up

Because the students used whiteboards as an exit ticket, I was able to quickly assess their conceptual understanding of this lesson objective.  What I realized is that a few students were still confused about how the area was removed, and other students seemed to understand how the remaining area remained the same no matter where the inner rectangle occurs.  This exit ticket is key to guiding instruction in one of the 4 Common Core Critical Areas for 3rd Grade (3. Developing understanding of the structure of rectangular arrays and of area).

Exit Ticket
Exit Tickets: Exit Ticket

# Area Within An Area

Unit 3: Measurement
Lesson 9 of 13

## Big Idea: Understanding and calculating the area of a space within another defined area better represents a real world problem.

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55 minutes

### Diane Siekmann

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