# Lesson 18 Which One Doesn’t Belong?

Let’s create a Which One Doesn’t Belong.

## Warm-up Which One Doesn’t Belong? Volume

Which one doesn’t belong?

## Activity 1 Which One Doesn’t Belong? Design 1

Choose 3 shapes from the set of cards.

Draw a fourth shape to complete the Which One Doesn’t Belong.

For each shape, discuss one reason why it does not belong.

A

B

C

D

## Activity 2 Which One Doesn’t Belong? Design 2

Choose 2 shapes from the set of cards.

Draw a third and fourth shape to complete the Which One Doesn’t Belong.

For each shape, discuss one reason why it does not belong.

Which one doesn’t belong?

A

B

C

D

## Activity 3 Which One Doesn’t Belong? Design 3

Create your own Which One Doesn’t Belong about any mathematical idea you want others to notice.

Which one doesn’t belong?

A

B

C

D