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# Comparing Solids

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Students will be able to use language such as pyramid, prism, face, and edge to describe solids. Students will be able to compare 3-D solids using their attributes.

(10 minutes)
• Invite your students to play "I Spy" with something familiar, such as colors.
• Reintroduce the game by using the attributes of shapes of solids. For example: I spy with my little eye something that can stack.
• Give your students three guesses before another attribute is added, such as: I spy with my little eye something that can stack and has 6 faces.
• Ask your students to guess the shape. When it has been guessed, have that same student come up with another clue.
(15 minutes)
• Explain to the students that they will be learning more about these solids.
• Display a rectangular prism, and raise a discussion on the shape. Potential guiding questions include: What attributes does this rectangular prism have? Where have you seen a rectangular prism?
• Repeat the questions with a cube and a pyramid.
• Explain to your students that they will be using new vocabulary to describe the shapes.
• Show a cube, and explain that the cube has six faces, or flat surfaces. Show that the cube has 8 vertices, or points, and that there are 12 edges, or lines that connect faces.
(10 minutes)
• Give each group of students a rectangular prism, a triangular prism, or a square pyramid.
• Have your students discuss how their solid is the same as another solid. Then, ask them to discuss how it is different from another group's solid.
• Instruct your students to select a cone, a cylinder, a sphere, or a cube and compare it to their first solid.
• Make sure your students are using new vocabulary to describe the solids.
• Ask your students to record their observations on a sheet of paper or in a journal.
(10 minutes)
• Have groups of students display their solids and tell which attributes are the same and which are different.
• Enrichment: Have your students draw the shapes on their own and fill in the faces with different colors. Ask your students to write a story that includes different solids.
• Support: Bring in more real-world objects to show your students what 3-D shapes can look like.
(5 minutes)
• Collect your students' notes on how their objects are similar and different.
• Make sure that they are using the vocabulary from earlier in this lesson.
(5 minutes)
• Review the names and attributes of solids.
• Hold up two solids, such as a triangular prism and a pyramid. Ask questions about the shapes, such as: How are a pyramid and a triangular prism the same? How are they different? How do you think a triangular prism got its name?

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