Mathematics
Grade 1
15 min
Count the shape's faces
Count the shape's faces
Tutorial Preview
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? π§± 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! π
Real-World Applications
Wrapping a birthday present π
Building with toy blocks π§Έ
Stacking cereal boxes at the store π₯£
Knowing how many sides a dice has π²
2
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. π
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. π²
CubeA special box shape where all faces are squares. All faces are the same size.An ice cube π§ or a building block.
Rectangular PrismA box shape, like a cube, but the faces can be rectangles.A juice box π§ 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. βΊοΈ
SphereA perfectly round shape like a ball. It has no flat parts.A basketball π or a marble.
3
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.
4 more steps in this tutorial
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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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