Understand that the perimeter of a regular polygon can be calculated by multiplication
Lesson details
Learning outcome
I can calculate the perimeter of a regular polygon using multiplication.
Key learning points
- If you know the length of one side of a regular polygon you can calculate the perimeter.
- Multiply the side length by the number of sides of the regular polygon to calculate the perimeter.
Keywords
Perimeter - The distance around a two-dimensional shape.
Regular - A regular polygon has all sides equal and all angles equal.
Common misconception
Pupils may overgeneralise and assume all perimeters can be calculated by multiplying one side length by the number of sides in the polygon.
'Noticing' is a key mathematical skill. Encourage pupils to take their time to notice whether the shape is regular or irregular, if that information is not already explicitly given.
Teacher tip
Pupils will revisit multiplication tables learned in Years 2 and 3 within this lesson. Fluent recall will allow for pupils to focus on the concept. Consider providing multiplication grids for pupils who are less confident.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of these describe this shape?
Q2.What is the perimeter of this rectangle?
Q3.Select all of the regular polygons.
Q4.Select all of the squares.
Q5.Which of these red lines shows the perimeter of the triangle?
Q6.Match the shape to the correct number of sides.
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Assessment exit quiz
6 Questions
Q1.What is the perimeter of a square with a side length of 4 cm? cm.
Q2.What is the perimeter of a regular triangle with a side length of 4 cm? cm.
Q3.What is the perimeter of a regular pentagon with a side length of 4 cm? cm.
Q4.What is the perimeter of a regular octagon with a side length of 4 cm? cm.
Q5.Order these shapes from smallest perimeter to longest.
Q6.Which of these shapes will have the same perimeter as each other?
To help you plan your 4 maths lesson on: Understand that the perimeter of a regular polygon can be calculated by multiplication, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 4 maths lesson on: Understand that the perimeter of a regular polygon can be calculated by multiplication, 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.