New
New
Know that the perimeter of a rectangle can be calculated by addition and multiplication
I can calculate the perimeter of a rectangle using addition and multiplication.
Lesson 6 of 10
New
New
- Year 4
Know that the perimeter of a rectangle can be calculated by addition and multiplication
I can calculate the perimeter of a rectangle using addition and multiplication.
Lesson details
Key learning points
- To calculate the perimeter of a rectangle you can double the lengths of the shorter and longer sides and add the values.
- To calculate the perimeter of a rectangle you can add one long and one short side and double the total.
- Mental and written methods can be used to calculate the perimeter of a 2D shape.
Keywords
Perimeter - The distance around a two-dimensional shape.
Double - Have two of something.
Common misconception
Pupils may not realise that, even when one of the long side and short side lengths is missing in a rectangle, they still have enough information as these are the same as the given lengths.
Counters are encouraged in this unit. It may be that some pupils still need the missing side lengths written on counters, but as with all scaffolding, this should only be temporary. Ask them - do you need this counter? Do you already know the number?
Doubling is a skill required in this lesson and you may wish to consider how you can practise this prior to using it. Pupils should be fluent in doubling and partitioning within 20 Consider how to support learners who are less fluent.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), 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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Prior knowledge starter quiz
6 Questions
Q1.Which expressions could be used to work out the perimeter of the shape?
Which expressions could be used to work out the perimeter of the shape?
4 + 2
4 + 2 + 4 + 2 + 4
Q2.What is the perimeter of this shape? units.
What is the perimeter of this shape? units.
Q3.Which of these expressions means the same as doubling 10?
Which of these expressions means the same as doubling 10?
10 + 10 + 10
10 − 5
10 + 2
Q4.Complete: Double 16 is equal to
Complete: Double 16 is equal to
Q5.Which of these statements is true of a rectangle?
Which of these statements is true of a rectangle?
All four sides are different lengths.
Q6.Complete this column addition.
Complete this column addition.
Assessment exit quiz
6 Questions
Q1.Which calculations will give the perimeter of this rectangle?
Which calculations will give the perimeter of this rectangle?
10 + 5
It is impossible to give the perimeter because there are missing side lengths.
Q2.What is the perimeter of this rectangle?
What is the perimeter of this rectangle?
9 units
13 units
14 units
Q3.What is the perimeter of this rectangle? units.
What is the perimeter of this rectangle? units.
Q4.Order these rectangles from shortest to longest perimeters.
Order these rectangles from shortest to longest perimeters.
Q5.What is the perimeter of this rectangle? units.
What is the perimeter of this rectangle? units.
Q6.What is the perimeter of this rectangle? units.
What is the perimeter of this rectangle? units.
