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# Prove it!

Lesson 1 of 10

## Objective: SWBAT identify key attributes for plane shapes. SWBAT create a set of rules that define what each shape is.

#### Setting Up the Learning

*5 min*

**Review**

You learned about shapes in Kindergarten. We are going to build on what you learned in K to help you think about shapes in more complex ways.

** Sing the Shapes Song. This is always a hit, even though it seems babyish!**

**Connect**

Shapes are really important because different people use them every day for their jobs. Engineers use shapes when they are designing different things. Architects use shapes to help them design buildings.

**Objective**

Today, we will review the important attributes of triangles, circles, squares, rectangles, hexagons and rhombuses.

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#### Opening Discussion

*15 min*

**Present Problem: I have a big bag of shapes I'm going to use to make Christmas decorations for my house. The problem is I don’t know what to call the shapes. You are going to teach me the names of the shapes and then prove it!**

I’ll present a chart with each shape name on it. Students place a picture of each shape on the chart (or in pocket chart). Then I’ll ask students to help me make rules for each shape. How do we know for sure that is the shape?

Before we discuss the actual shapes, we will define the terms “side” and “corner”.

**Guiding Questions:**

- What shape is this?
- How are you sure that is the shape?
- What sentence could I write to prove that this is the shape?
- How are you sure this is a rectangle, not a square?

**Probing Questions: **These questions get at students understanding of important shape attributes. The standard (1.G.A.1) asks students to think about whether or not an attribute that a shape has actually matters.

-Is this a triangle because it is yellow ?

-Is this a circle because it is big?

-What if I turn this shape on its side? Will it still be a triangle? How are you sure?

-What if I added another side to it? Would it still be a triangle? Why not?

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#### Student Share

*15 min*

Students practice identifying shapes and listing key attributes for them in a group activity.

I’ll have students sit in little circles on the rug. They will each get 4 shape cards from an envelope. Then they will take turn laying the shape cards in one of the shape groups.

Sentence stem to scaffold this Common Core level discussion!

**“This is a ___________. I know because ___________________”**

Then the student can add it to the group of shapes.

**See this video of a group doing this activity!**

After students finish, I'll show a picture/doc camera view on promethean board or have students stand around one group of objects and determine if the grouping is correct.

- What shape name do you think this group used to describe these shapes? How are you sure?

**See attached document for the shape cards I used! I printed them on different colored paper so students could see that the shape stays the same, even if it is on a different color.**

#### Resources

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#### Independent Practice

*15 min*

Students cut out pictures and sort them into groups, labeled with the shape name. Students write at least 1 attribute that the shape has, aligned to the CCSS focus on writing across the curriculum.

**Group A: Intervention**

Students cut out and sort 2 pictures per category. Students may do this with a “reading partner” if needed. Students may need to be interviewed for writing portion.

**Group B: Right on Track**

Students cut out and sort 2 pictures per category. Students write a rule to go with each category.

**See attached documents for Independent Practice!**

#### Resources

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#### Closing

*5 min*

Students share one shape category with a partner and explain how they knew what those shapes were.

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I really liked the whole lesson, esp. the collaborative activity. Thank you!

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- UNIT 1: Creating a Culture of Math
- UNIT 2: Count to 100 Every Day!
- UNIT 3: 10: A First Grader's Best Friend
- UNIT 4: Charting and Analyzing Data
- UNIT 5: Inch by Inch, Paperclip by Paperclip
- UNIT 6: Properties of Addition and Subtraction
- UNIT 7: Shapes and Blocks
- UNIT 8: Understanding Equality
- UNIT 9: Adding and Subtracting: Base Ten
- UNIT 10: Solving 3 Addend Problems
- UNIT 11: Missing Parts: Unknowns in All Positions
- UNIT 12: Parts of a Whole
- UNIT 13: Tick Tock, Tick Tock
- UNIT 14: Time is Money: Hitting all the MD Standards
- UNIT 15: Base 10 Bonanza
- UNIT 16: What the WHAT?! Teaching Challenging Story Problems

- LESSON 1: Prove it!
- LESSON 2: What's your rule?
- LESSON 3: Riddle Me This
- LESSON 4: More Ways Than One
- LESSON 5: More and Fewer: Ways to Make
- LESSON 6: Ways to Make: Hexagon Edition
- LESSON 7: Triangles, Triangles, Triangles
- LESSON 8: Here are the 3D Shapes That I Know
- LESSON 9: Boxes and Blocks
- LESSON 10: Building Santa's Workshop