New
New
Year 4
Know that perimeter can be calculated by adding together the side lengths of a 2D shape
I can calculate the perimeter of a 2D shape by adding together the lengths of the sides.
New
New
Year 4
Know that perimeter can be calculated by adding together the side lengths of a 2D shape
I can calculate the perimeter of a 2D shape by adding together the lengths of the sides.
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Lesson details
Key learning points
- Perimeter is the sum of the side lengths of a 2D shape.
- If you measure the side lengths you can add them to calculate the perimeter.
- Mental and written methods can be used to calculate the perimeter of a 2D shape.
Keywords
Perimeter - The distance around a two-dimensional shape.
Common misconception
Pupils may believe that there is only one way to add the perimeter of a shape - typically clockwise, starting from the top. This is untrue and will limit the efficiency of the arithmetic.
The lesson presents the idea of the side lengths being given in counters. The counters can then be re-ordered, for example so that a number bond to ten can be utilised. Using counters or sticky notes or similar may support pupils.
This lesson uses fluency in addition and pupils should be secure in number bonds within 20 and summing single digits mentally. Consider how you may revisit these key facts prior to the lesson or provide a scaffold for less fluent learners.
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.
Match the numbers so that they sum to 10
3
5
6
8
Q2.
Complete: 4 + 3 + 4 + 3 =
Q3.
Match the unit of measure to the correct abbreviation.
mm
cm
m
km
Q4.
16 + 8 =
Q5.
This shape has a perimeter of units.
Q6.
What is the perimeter of this shape? units.
Exit quiz
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6 Questions
Q1.
Which calculations could be used to work out the perimeter of the number shape?
3 + 2
3 + 2 + 3 + 2 + 3
Q2.
Use adding to find the perimeter of the shape. The perimeter is units.
Q3.
Laura says the perimeter of this shape is 6 units. What mistake do you think she has made?
Counted one side twice.
Counted the squares inside the shape.
Q4.
What is the perimeter of this shape? units.
Q5.
Which of these statements is true?
There is not enough information to work out the perimeter of this rectangle.
Q6.
What is the perimeter of this square? units.
