Know that perimeter can be calculated by adding together the side lengths of a 2D shape
Lesson details
Learning outcome
I can calculate the perimeter of a 2D shape by adding together the lengths of the sides.
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.
Teacher tip
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.
Licence
Lesson video
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Prior knowledge starter quiz
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.
Assessment exit quiz
6 Questions
Q1.Which calculations could be used to work out the perimeter of the number shape?
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?
Q4.What is the perimeter of this shape? units.
Q5.Which of these statements is true?
Q6.What is the perimeter of this square? units.
To help you plan your 4 maths lesson on: Know that perimeter can be calculated by adding together the side lengths of a 2D shape, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 4 maths lesson on: Know that perimeter can be calculated by adding together the side lengths of a 2D shape, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 2 maths lessons from the Perimeter unit, dive into the full primary maths curriculum, or learn more about lesson planning.