New
New
Year 4
Know that the perimeter is the distance around a 2D shape
I know that the perimeter is the distance around a 2D shape.
New
New
Year 4
Know that the perimeter is the distance around a 2D shape
I know that the perimeter is the distance around a 2D shape.
Lesson details
Key learning points
- Perimeter is a measurement of length.
- Perimeter is the distance around a 2D shape.
Common misconception
When finding the perimeter of a shape, pupils may count one side twice, or not count one of the sides.
Examples and non-examples of perimeter are given but encourage pupils to mark a 'start point' when they find the perimeter of a shape, so that they know where to end.
Keywords
Perimeter - The distance around a 2D shape.
This lesson has deliberately been designed to be number-free so that pupils can develop conceptual understanding of perimeter before they look at the associated arithmetic. Be as practical as possible. You may wish to used skipping ropes to explore larger perimeters.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
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6 Questions
Q1.
Which of these shapes has string around its outline?
b
c
Q2.
Which of these symbols means ‘greater than’?
<
=
Q3.
Which of these shapes are 2D shapes?
Q4.
Is this a 2D shape? Select the best answer and reason.
Yes. It is a triangle.
No. It is a 3D shape.
Q5.
Number rods have been used to make polygons. Which ones are polygons?
B
Q6.
Which 2D shapes can you see on this football pitch?
Square
Hexagon
Exit quiz
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6 Questions
Q1.
Which of these is the definition of perimeter?
A straight line.
The space inside a 2D shape.
Q2.
Which of these are true of perimeter?
It does not matter if you go inside or outside the lines when finding perimeter.
Q3.
Which of these shows the perimeter of the triangle?
a
c
d
Q4.
In terms of perimeter, which of the statements are true of this image?
Shape A and B have equal perimeter.
The perimeter of Shape A is greater than Shape B.
The perimeter of Shape B is less than Shape A.
Q5.
In terms of perimeter, which of the statements are true of this image?
Shape A and B have equal perimeter.
The perimeter of Shape A is less than Shape B.
The perimeter of Shape B is greater than Shape A.
Q6.
Order the shapes according to their perimeter, starting with the shortest perimeter.
