Corner Counts: Discovering Vertices in 2D Shapes!

Math Grades 1st Grade 4:25 Video
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Lesson Description

Let's learn about vertices (corners) in 2D shapes! This lesson uses a fun video to help you count the vertices of shapes like triangles, rectangles, and more.

Video Resource

2 Dimensional Shapes: Vertices | Math for 1st Grade | Kids Academy

Kids Academy

Duration: 4:25
Watch on YouTube

Key Concepts

  • Two-dimensional (2D) shapes
  • Vertices (corners)
  • Counting

Learning Objectives

  • Students will be able to define a vertex as a corner where two lines meet.
  • Students will be able to count the vertices of common 2D shapes (triangle, rectangle, oval, hexagon, rhombus).

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they know about shapes. Show them different 2D shapes and ask them to name them. Introduce the word 'corner'. Ask them what they know about corners.
  • Video Time (7 mins)
    Watch the '2 Dimensional Shapes: Vertices' video from Kids Academy. Encourage students to pay attention to how the teacher counts the vertices of each shape.
  • Shape Exploration (10 mins)
    Distribute shape cutouts (triangle, rectangle, oval, hexagon, rhombus) to students. Have them trace the shapes with their fingers and count the vertices. Encourage them to say 'This shape has [number] vertices!'.
  • Worksheet Practice (10 mins)
    Provide a worksheet with pictures of different 2D shapes. Have students circle the number of vertices for each shape. (Create similar to video worksheet).
  • Wrap Up (3 mins)
    Review the definition of a vertex. Ask students to name shapes and the number of vertices they have.

Interactive Exercises

  • Shape Sort
    Provide a collection of 2D shapes. Have students sort them based on the number of vertices (e.g., shapes with 3 vertices, shapes with 4 vertices, etc.).
  • Vertex Hunt
    Give students magazines or newspapers. Ask them to find pictures of 2D shapes and circle the vertices.

Discussion Questions

  • What is a corner called in math?
  • Can you find any corners in the classroom? What shapes are they?

Skills Developed

  • Shape recognition
  • Counting
  • Vocabulary building (vertices, shapes)
  • Fine motor skills (tracing, circling)

Multiple Choice Questions

Question 1:

What is another word for a corner in math?

Correct Answer: Vertex

Question 2:

How many vertices does a triangle have?

Correct Answer: 3

Question 3:

How many vertices does a rectangle have?

Correct Answer: 4

Question 4:

Does an oval have any vertices?

Correct Answer: No

Question 5:

How many corners does a square have?

Correct Answer: 4

Question 6:

A hexagon has how many vertices?

Correct Answer: 6

Question 7:

Which shape has 0 vertices?

Correct Answer: Oval

Question 8:

A rhombus has how many vertices?

Correct Answer: 4

Question 9:

What do we call corners in shapes?

Correct Answer: Vertices

Question 10:

Which of these is NOT a shape?

Correct Answer: Number

Fill in the Blank Questions

Question 1:

A vertex is where two ______ meet to make a corner.

Correct Answer: lines

Question 2:

A triangle has ______ vertices.

Correct Answer: 3

Question 3:

An oval has ______ vertices.

Correct Answer: 0

Question 4:

A rectangle has ______ vertices.

Correct Answer: 4

Question 5:

The corners of a shape are called ______.

Correct Answer: vertices

Question 6:

A hexagon has ______ vertices.

Correct Answer: 6

Question 7:

A rhombus has ______ vertices.

Correct Answer: 4

Question 8:

We can count ______ to find vertices.

Correct Answer: corners

Question 9:

A _______ is a shape with four equal sides and four corners

Correct Answer: square

Question 10:

A shape that has three sides and three vertices is called a _______

Correct Answer: triangle

Educational Standards

1.G.A.1:Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes. CCSS.Math.Content.1.OA.C.5:Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

Teaching Materials

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Student Worksheet Classroom Slides Assessment Quiz Export to Google Docs
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