# 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?

## 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

## Practice Problem

## Problem 1

Here is how Diego sorted some shape cards.

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