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# Area With Halves

Lesson 11 of 13

## Objective: SWBAT understand that a closed figure or space covers area and halves of unit squares can also be counted

*55 minutes*

#### Warm-Up

*15 min*

*I saw this really cool figure that was drawn out, but it had some diagonal lines in it and I wondered if I could still find the area of it. I want you guys to take a look at some shapes I have drawn on the board. What do you notice? *(accept student responses)

*I want you to turn and talk to your elbow partner about how you think you can find the area of these figures.*

After students discuss we share some ideas. I make the connection to halves with fractions and how 2 halves equal 1 whole. We practice applying this understanding to the examples on the board.

#### Resources

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#### Group Work

*35 min*

*I have some pretty cool shapes that I made, but there are so many halves on them I am having trouble finding the area of each one. I will need your help today finding the area of these figures!*

It is important here that I allow students time to work at their tables to try applying the different tools we’ve learned so far to find area (MP1). I will be looking at who is still counting unit squares 1 by 1, who is dividing their shape up and multiplying and who is using all tools, as needed (MP5).

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#### Close

*5 min*

*You guys got some great practice finding area of irregular shapes. You showed me that you can use unit squares and halves of unit squares to find the total area of irregular shapes. Who would like to share something new they learned today?*

Some of your students may need some support in presenting / defending their thinking. It is appropriate to give them sentence frames, because they are still doing the thinking and speaking (using math vocabulary of course).

I always think it is important to allow students opportunities to share their work. They take much more pride in their work when they know it is acknowledged and celebrated by their classmates and teacher.

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Environment: Urban

- UNIT 1: Crazy About Fractions
- UNIT 2: Sharing Equally with Division
- UNIT 3: The Relationship Between Multiplication and Division
- UNIT 4: Number Lines
- UNIT 5: Multiply or Divide with Word Problems
- UNIT 6: Telling Time
- UNIT 7: Problem Solving
- UNIT 8: 2-Digit by 1-Digit Multiplication
- UNIT 9: Measurement and Data
- UNIT 10: Math in the Real World
- UNIT 11: More Problem Solving Practice
- UNIT 12: Addition & Subtraction
- UNIT 13: 3rd Grade Expectations
- UNIT 14: Geometry
- UNIT 15: Surveys and Graphing
- UNIT 16: Fun with Multiplying and Dividing

- LESSON 1: Standard and Non-Standard Units of Measurement
- LESSON 2: What is the Perimeter?
- LESSON 3: Perimeter is All Around Us!
- LESSON 4: My Unique Perimeter Performance Task
- LESSON 5: Graphing with M&M's
- LESSON 6: Design Your Dream House
- LESSON 7: Comparing Lengths
- LESSON 8: What is Area?
- LESSON 9: Length x Width
- LESSON 10: Design Your Dream House- Day 2
- LESSON 11: Area With Halves
- LESSON 12: Area Assessment
- LESSON 13: The Difference Between Mass and Customary Weight