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Authoritative PPT Summary
"Expand and Fold" Cuboid (1) PPT
Part One: Learning Objectives
1. Understand the characteristics of expanded diagrams of cuboids and cubes. (emphasis)
2. Understand the correspondence between expanded diagrams, cuboids and cubes. (difficulty)
Expand and collapse PPT, part 2: exploring new knowledge
Knowledge points Characteristics of expanded cube diagrams
(1) Please find a cube box, cut it, and draw the expanded picture you get.
(2) The whole class communicated and how many different shapes of unfolded pictures were cut out? Let’s talk about how the difference is obtained.
(3) Work with partners to refold each expanded diagram into a cube.
Knowledge refining
The shape of the expanded diagram of the cube is not single. If it is cut along different edges, the expanded diagram will have different shapes.
Knowledge Points Application of Expanded Figures of Cuboids and Cubes
(4) The following is an expanded view of a cuboid and a cube. Please tell us which faces are opposite faces 1, 2, and 3 respectively? Think about it first, and then try it using Figure 1 on Appendix 1.
Knowledge refining
To determine which two faces are a set of opposite faces from the unfolded view of a cuboid or cube, you can judge based on the characteristics of the unfolded view of the cuboid or cube, or you can fold a physical object and find it intuitively.
Expand and fold PPT, Part 3: Consolidation exercises
1. Which of the following shapes can form a cube ( ).
2. Connect the cuboid and cube below with the corresponding expanded diagrams.
3. There are four cubes in the picture below. Only one is formed by folding the paper on the left. Please indicate which one it is.
Expand and collapse PPT, Part 4: Class summary
What knowledge have you learned in this class?
The shape of the expanded diagram of the cube is not single. If it is cut along different edges, the expanded diagram will have different shapes.
You can judge the opposite sides of the expanded cuboid or cube based on the characteristics of the expanded cuboid or cube, or by folding the actual object.
Expand and collapse PPT, Part 5: Homework
Assignment 1: Complete the exercises related to the textbook.
Assignment 2: Complete the corresponding exercises.
Keywords: Free download of Beijing Normal University Edition fifth grade mathematics PPT courseware for volume 2, expand and fold PPT download, cuboid PPT download, .PPT format;
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