Describe the relationship between scale factors and perimeters of two shapes
I can describe the relationship between scale factors and side lengths and perimeters of two shapes.
- Year 6
Describe the relationship between scale factors and perimeters of two shapes
I can describe the relationship between scale factors and side lengths and perimeters of two shapes.
Lesson details
Key learning points
- If the lengths of the sides of a shape have been doubled, the perimeter will be double.
- If the side lengths of a shape are multiplied by the same factor the perimeter will be multiplied by the same factor.
- The number which all the sides have been multiplied by is called a scale factor.
Keywords
Perimeter - Perimeter is the distance around a two-dimensional shape.
Scale factor - A scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.
Similar - Two shapes are similar when one shape can become the other after a resize, flip, slide or turn.
Common misconception
Pupils may remember to scale one of the sides (or pairs of sides) of a shape but forget to scale the others.
Focus attention on what it means when a shape is similar, drawing on examples and non-examples to support learners to understand how scaling affects all side lengths.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Double 17 is
Q2.Multiply 16 by 4
Q3.Which of these is the same as dividing by two?
Q4.Match the words to their correct definitions.
Q5.Match the equations to the correct product.
