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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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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.

Download all resources
Share activities with pupils

Lesson details

Key learning points

  1. Perimeter is measured in units of length.
  2. Perimeter can be counted if shapes are presented on squared paper.
  3. Perimeter can be measured using a ruler.

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.

Keywords

  • Perimeter - The distance around a two-dimensional shape.

  • Unit - The unit of one of something that defines the 'one' you are counting in.

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).

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Starter quiz

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6 Questions

Q1.
Which of these shows the correct way to measure the line?
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
Q2.
Which of these shows the perimeter of the triangle?
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
Q3.
Which of these shapes has a different perimeter to the other two?
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q4.
Select all of the statements that are true of this number shape.
An image in a quiz
Correct answer: It has a perimeter.
Its outline forms a regular shape.
Correct answer: It has squares inside it.
Q5.
Is it possible for two different rectangles to have the same perimeter?
Correct answer: Yes, but it depends on the distance around them.
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?
An image in a quiz
Correct answer: They have the same perimeter.
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.
An image in a quiz
Correct Answer: 8, eight
Q2.
Equal-sized matchsticks have been used to find the approximate perimeter of this square. The square has a perimeter of around units.
An image in a quiz
Correct Answer: 8, eight
Q3.
How can you find the perimeter of this shape?
An image in a quiz
Count all the surrounding squares.
Count the squares inside the shape.
Correct answer: Count the units around the outside of the shape.
Q4.
What is the perimeter of this shape? units.
An image in a quiz
Correct Answer: 12
Q5.
What is the perimeter of this shape? units.
An image in a quiz
Correct Answer: 14
Q6.
Lucas says the perimeter of the shape is 10 units. What mistake might he have made?
An image in a quiz
Correct answer: Not counting one of the sides of the shape.
Counting the squares inside the shape.
Counting one of the sides twice.