Find the value of each expression mentally.

Your teacher will give you a set of cards.

1. Sort the cards into 2 categories of your choosing. Be ready to explain the meaning of your categories.

2. Match each diagram to an expression. Some diagrams match more than 1 expression.

3. Work with your partner to find the area of each shaded region. Explain or show your reasoning.

For each diagram, write as many expressions as you can to represent the area of the shaded region in square units.