Lesson 3 Shapes That Are Flat

    • Let’s sort flat shapes and explain how we sorted.

Warm-up Which One Doesn’t Belong: All the Shapes

Which one doesn’t belong?

  1. Solid shape, cube.
  2. Solid shape with a circle and a point.
  3. Solid shape. Shaded blue. Circle on top and bottom.
  4. Circle.

Activity 1 Card Sort: Flat Shapes

With your partner, sort your shape cards into groups. Give each group a category. Remember, a category is a label that tells how objects in a group are alike. Explain each category you made. Then sort the cards in a different way.

Activity 2 Shape Sort Gallery Walk

  1. Group 1:

    They sorted

  2. Group 2:

    They sorted

  3. Group 3:

    They sorted

Practice Problem

Problem 1

Here is how Diego sorted some shape cards.

Chart, 2 groups. Circles of different sizes. Closed shapes with 3, 4, or 6 straight sides.

Draw each shape where it belongs on Diego’s chart.

Circle.