Formative Assessment
## Do students understand that a collection of centimeter cubes equal to the volume of a rock will displace an equal amount of water?

For **evidence**, observe students as they work, listen to their conversation with peers, ask questions, e.g., “Would you tell me about what you are doing?”

To **interpret** the **evidence**, ask yourself; Does this student:

- Begin with equal volumes of water?
- Compare the water level of the rock and cubes and note that when the water levels are equal, the number of cubes are equal to the volume of the rock?
- Count the number of cubes and describe the volume of the rock in cubic centimeters?

A possible **next step** would be to ask students to use props or drawings to describe what they did, why they did it, and what they found out.