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Sort 2D and 3D shapes | Year 3 Mathematics PDF Download

Sorting Shapes

  • To effectively categorize 2D and 3D shapes, we rely on distinct characteristics such as the number of sides or faces.

2D Shapes

  • JJ is arranging shapes in order of sides, starting from the fewest to the most.
    Sort 2D and 3D shapes | Year 3 Mathematics
  • Counting the number of sides is fundamental. Ensure each side is only counted once.
  • When counting sides, avoid counting the same side multiple times.
    Sort 2D and 3D shapes | Year 3 Mathematics
  • Understanding the sides of each shape enables us to arrange them from the least sides to the most sides.
    Sort 2D and 3D shapes | Year 3 Mathematics

Importance of Investigation

  • Investigation plays a pivotal role in mathematics as it helps us identify various patterns and rules. For example:
  • Observing that two shapes may have the same number of sides but appear different.

Question for Sort 2D and 3D shapes
Try yourself:
Which of the following shapes has the fewest number of sides?
View Solution

Sorting Shapes by Vertices

  • Another method of classification is based on the number of corners, known as vertices, a shape possesses.
    Sort 2D and 3D shapes | Year 3 Mathematics
  • Let's examine the shapes again, this time focusing on counting the vertices.
    Sort 2D and 3D shapes | Year 3 Mathematics 
  • Do you notice any patterns? In 2D shapes, the number of vertices is equal to the number of sides.
    Sort 2D and 3D shapes | Year 3 Mathematics

3D Shapes

Exploring the properties of 3D shapes can reveal interesting characteristics.
Let's assist JJ in determining the vertices, faces, and edges of a specific 3D shape.
Sort 2D and 3D shapes | Year 3 MathematicsLet's count the vertices and faces together, organizing our findings in a table.
Sort 2D and 3D shapes | Year 3 MathematicsInvestigation involves testing ideas. JJ theorizes that 3D shapes have the same number of edges as vertices, akin to our earlier observation with 2D shapes.
Lets verify this theory by counting the edges.
Sort 2D and 3D shapes | Year 3 MathematicsThis particular shape has 6 edges.
JJ's hypothesis was proven wrong.
It's essential to embrace incorrect ideas as part of the investigative process in mathematics.

Example

Example: Did you notice that this shape has the same amount of vertices as faces?
Does that mean all 3D shapes have the same amount of vertices and faces?
Let's test that theory - count the faces, vertices and edges of these 3D shapes.
Sort 2D and 3D shapes | Year 3 MathematicsLet's see if the theory is correct.
Sort 2D and 3D shapes | Year 3 Mathematics

Not all 3D shapes have the same number of vertices and faces so the theory was incorrect.
Don’t be afraid to make mistakes – mistakes help you learn.
This is what investigating is all about!

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