Sorting 3D Shapes - math grade 2 - lesson 49

Note to the Teacher: In today’s lesson, students continue to explore three-dimensional shapes. Students cut out images of the 3D shapes and sort them according to attributes. To save lesson time, consider cutting out the shape cards ahead of time and giving them to students to sort.

1.TEACHER DO: Display the three-dimensional shapes from Lesson 48.

TEACHER DO: Point to the completed chart on the board.

TEACHER SAY: I am going to give you some clues. If you think you know the shape I am describing, you pop up. I will then call on someone who is popped up to come to the front and hold up the shape. Ready?

TEACHER DO: Select a three-dimensional shape (without revealing the name of it to students). State attributes of the shape. Call on a student who has popped up to come to the front and find an example to show the class. Have student state the shape’s name. If the student is having trouble remembering, you can help them with the name of the shape.

Examples:

• This shape has two circle faces. It does not have any vertices. (cylinder)
• This shape has five vertices. It has five faces. One of its faces is a square. (square-based pyramid)
• This shape has 8 vertices and 12 edges. All of the faces are the same shape. (cube)

STUDENTS DO: Listen to clues and pop up if they know what shape is being described. Selected students go to the front, find an example, and state the name of shape. Return to seat when finished.

TEACHER DO: Repeat the process for 3 or 4 three-dimensional shapes.

TEACHER SAY: Good work. You really know your shapes. Let’s Apply our learning and sort the shapes into categories. Open your student book to page Lesson 49: Apply.

STUDENTS DO: Open the student book to page Lesson 49: Apply.

TEACHER DO: Display your large copy of the chart on page Lesson 49: Apply in the student book.

TEACHER SAY: On this page, you have pictures and names of all the three-dimensional shapes that we have been talking about. Cut out the shapes.

TEACHER DO: Hand out (or have students take out) scissors.

STUDENTS DO: Cut out the shape cards in the student book.

TEACHER DO: When students have cut out their shapes, give directions for the sorting activity.

TEACHER SAY: In your student book, there are boxes with attribute descriptions at the top. This first box says shapes with 4 or more faces.

TEACHER DO: Point to the chart you displayed on the board.

TEACHER SAY: You will look at all of the shapes and see which ones have 4 or more faces. When I find a shape that fits the attribute description, I will put it in the box. If the shape does not fit the description, I will leave it out. Give me a Thumbs Up if you would like to come up and show us which shapes fit in the box that says shapes with 4 or more faces.

STUDENTS DO: Give a Thumbs Up to volunteer. Selected student goes to the chart and identifies three-dimensional shapes that have 4 or more faces. Student tapes the shapes into the box.

TEACHER SAY: Yes, the rectangular prism, the cube, and the square-based pyramid all have 4 or more faces. Now it is your turn to sort the shapes. Work by yourself to place the shapes that fit that attribute description in the second box. You will not glue them down because some shapes will belong in more than one box. When both you and your Shoulder Partner are done, compare your answers to see if you agree. Once you both agree, take out the shapes and move on to the next attribute description. Give me a Thumbs Up if you are ready to sort.

STUDENTS DO: Give a Thumbs Up when ready. Begin working independently to identify shapes that fit each attribute description. Compare answers with their Shoulder Partner. Repeat the process for each description.

TEACHER DO: Walk around the classroom, observing students as they work. If Shoulder Partners quickly finish all the boxes, have them make up rules for each other. When Learn time is over, use an Attention Getting Signal to bring the group back.

TEACHER SAY: Wonderful work today.