3D Shapes – Basic 1 Mathematics Lesson Note (Second Term)

Three dimensional shapes

Basic 3D Shapes:

Cube: □ (like a dice)

• Has 6 faces
• All faces are squares

Sphere: ○ (like a ball)

• Round all around
• No flat faces

Cylinder: ⭕ (like a can)

• Round body
• 2 flat circular faces

Cone: △ (like ice cream cone)

• Pointed top
• Round base

Exercise 10: Name these 3D shapes:

1. A ball is a _____
2. A dice is a _____
3. A can is a _____
4. An ice cream cone is a _____

Exercise 11: Count the faces:

1. A cube has _____ faces
2. A sphere has _____ flat faces
3. A cylinder has _____ flat faces

Exercise 12: Find 3D shapes around you:

1. Name something that is a sphere: _____
2. Name something that is a cube: _____
3. Name something that is a cylinder: _____

5. Compose big shapes from smaller shapes

Making Big Shapes: We can put small shapes together to make bigger shapes.

Exercise 13: How many triangles make this shape? [Draw a diamond made of 2 triangles] Answer: _____ triangles

Exercise 14: How many squares make this rectangle? [Draw a rectangle made of 2 squares] Answer: _____ squares

Exercise 15: Complete the big shape using small triangles: [Show outline of a bigger triangle to be filled with smaller triangles]

Exercise 16: Use 4 squares to make a big square: [Show space to draw]

6. Decompose shapes into smaller shapes

Breaking Big Shapes Apart: We can break big shapes into smaller pieces.

Exercise 17: This rectangle can be divided into _____ squares: [Draw a rectangle with dotted lines showing 3 squares]

Exercise 18: This triangle can be divided into _____ smaller triangles: [Draw a triangle with lines showing 4 smaller triangles]

Exercise 19: Draw lines to divide this circle into 2 parts: [Draw a circle]

Exercise 20: Draw lines to divide this square into 4 smaller squares: [Draw a square]

7. Description of shapes and numbers

Describing Numbers: Exercise 21: Describe these numbers:

1. 245 has _____ hundreds, _____ tens, _____ ones
2. 250 has _____ hundreds, _____ tens, _____ ones

Describing Shapes: Exercise 22: Complete the descriptions:

1. A cube is a _____ shape with _____ faces
2. A sphere is _____ like a ball
3. A cylinder is _____ with 2 flat ends

Exercise 23: Match shapes to descriptions:

• Round all around → Cube
• 6 square faces → Cylinder
• Round with flat ends → Sphere
• Pointed top → Cone

Exercise 24: Fill in the blanks:

1. I can make a big square using _____ small squares
2. I can divide a rectangle into _____ triangles
3. A _____ container can hold more than an _____ one