Lesson 5 Circles and Triangles

    • Let’s learn the names of some shapes.

Warm-up Which One Doesn’t Belong: Shape Attributes

Which one doesn’t belong?

  1. Blue rectangle.
  2. Red triangle.
  3. Shape with one curved side.
  4. Blue triangle.

Activity 1 Color Circles and Triangles

Problem 1

Shapes, 5 triangles.
5 circles, different sizes.

Problem 2

  1. Group of shapes.
  2. Green triangle.
    Blue circle.

Activity 2 Triangle Sort

Let’s put the shapes into 2 groups.


Line to separate the 2 groups.

Not a Triangle

Triangle, crossed out.

Activity 3 Introduce Counting Collections, Up To 20

Choose a center.

Counting Collections

Center. Counting Collections.

Which One

Picture Books

Center. Picture books.


Center. Bingo.

Shake and Spill

Center activity, shake and spill.

Practice Problem

Problem 1

Color in the triangles.
Cross out the shapes that are not triangles.

6 shapes.