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Objects that are 3D have length, width, and depth. For example, the pyramids in the video are 3D objects. They have volume. But the sides of the pyramids are triangles. Triangles are flat or 2D objects. They only have length and width. They do not have volume.

People in the United States sometimes measure liquid volume in liters. Liters are part of the metric system. In this system, small amounts of liquids are measured in milliliters. One liter is 1,000 milliliters. Soda often comes in liters. Many plastic soda bottles hold a standard volume of 2 liters (68 fl. oz).

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Making Connections

Text-to-Self

Have you ever seen someone measure volume? What tool did that person use?

Text-to-Text

Have you read other books about volume? What did you learn?

Text-to-World

A recipe asks for 3 ½ cups of water. Morris has a 1-cup measuring cup and a ½-cup measuring cup. How can Morris measure out the right amount of water?

Teacher Resources

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