New
New
Year 4
Know that perimeter is measured in units of length and can be found by counting or measuring units
I know that perimeter is measured in units of length and can be found by counting or measuring units.
New
New
Year 4
Know that perimeter is measured in units of length and can be found by counting or measuring units
I know that perimeter is measured in units of length and can be found by counting or measuring units.
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Lesson details
Key learning points
- Perimeter is measured in units of length.
- Perimeter can be counted if shapes are presented on squared paper.
- Perimeter can be measured using a ruler.
Keywords
Perimeter - The distance around a two-dimensional shape.
Unit - The unit of one of something that defines the 'one' you are counting in.
Common misconception
Pupils may count a side twice, or miss a side, if they do not remember where their starting point was on the shape when counting the perimeter.
Encourage pupils to mark a starting point, or use dots to mark the units they have counted.
Pictures of number blocks, and pictures of leaves, are provided. However, nothing is better than pupils having hands on experiences using manipulatives so if you are able to access these in real life, please do.
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).Lesson video
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Starter quiz
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6 Questions
Q1.
Which of these shows the correct way to measure the line?
Q2.
Which of these shows the perimeter of the triangle?
Q3.
Which of these shapes has a different perimeter to the other two?
Q4.
Select all of the statements that are true of this number shape.
Its outline forms a regular shape.
Q5.
Is it possible for two different rectangles to have the same perimeter?
Yes, because all rectangles have the same perimeter.
No. If they are two different rectangles they must have a different perimeter.
Q6.
What is true of this pair of 2D shapes?
They have different perimeters.
It is impossible to say which one has a bigger perimeter.
Exit quiz
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6 Questions
Q1.
This number shape is made of smaller squares. Complete the sentence. This shape has a perimeter of units.
Q2.
Equal-sized matchsticks have been used to find the approximate perimeter of this square. The square has a perimeter of around units.
Q3.
How can you find the perimeter of this shape?
Count all the surrounding squares.
Count the squares inside the shape.
Q4.
What is the perimeter of this shape? units.
Q5.
What is the perimeter of this shape? units.
Q6.
Lucas says the perimeter of the shape is 10 units. What mistake might he have made?
Counting the squares inside the shape.
Counting one of the sides twice.