Mathematics Grade 1 15 min

Count the shape's faces

Count the shape's faces

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1

Introduction & Learning Objectives

Learning Objectives Identify a 'face' on a 3D shape. Count all the faces on a cube. Count all the faces on a rectangular prism. Count the faces on a square pyramid. Explain that a sphere has zero flat faces. Use a 'touch and count' method to find the total faces. Have you ever built a tower with blocks? 🧱 Let's learn about their flat parts! Today, we will learn what a 'face' is. We will become experts at counting the faces on our 3D shapes. It's like a fun counting game! πŸŽ‰ Real-World Applications Wrapping a birthday present 🎁 Building with toy blocks 🧸 Stacking cereal boxes at the store πŸ₯£ Knowing how many sides a dice has 🎲
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Key Concepts & Vocabulary

TermDefinitionExample 3D ShapeA solid shape that you can hold in your hand. It is not flat.A toy block, a ball, or a party hat. 🎈 FaceA face is a flat part of a 3D shape. You can lay your hand flat on it.The square side of a dice is one face. 🎲 CubeA special box shape where all faces are squares. All faces are the same size.An ice cube 🧊 or a building block. Rectangular PrismA box shape, like a cube, but the faces can be rectangles.A juice box πŸ§ƒ or a cereal box. PyramidA shape with a flat bottom that comes to a point at the top.The great pyramids in Egypt look like this. ⛺️ SphereA perfectly round shape like a ball. It has no flat parts.A basketball πŸ€ or a marble.
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Core Formulas

Touch and Count Method Touch each face + Say the number = Total faces Use this for any shape. Touch each flat face one time as you count out loud. Cube and Box Rule 1 (top) + 1 (bottom) + 4 (sides) = 6 faces This is a fast way to count faces on cubes and rectangular prisms. Pyramid Rule 1 (bottom) + Number of triangle sides = Total faces First, count the bottom face. Then, count the triangle faces that go up to the point.

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Sample Practice Questions

Challenging
I have two different shapes. Together they have 7 flat faces. One shape is a cube. What is the other shape?
A.cone
B.cylinder
C.Another cube
D.sphere
Challenging
If you add the number of flat faces on a cylinder and the number of flat faces on a cone, what is the total?
A.2
B.3
C.4
D.5
Challenging
I am thinking of a shape that has one less face than a cube. It has some triangle faces. What is it?
A.cylinder
B.triangular prism
C.cone
D.square pyramid

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