Myths about teaching can hold you back
- Year 7
Describing an enlargement
I can understand the minimum information required to describe an enlargement
- Year 7
Describing an enlargement
I can understand the minimum information required to describe an enlargement
Lesson details
Key learning points
- The scale factor is the multiplier.
- The centre of enlargement defines where the image will be placed in relation to the object.
- The object and enlarged image have the same orientation for positive scale factors.
Keywords
Centre of enlargement - The centre of enlargement is the point from which a shape is enlarged.
Scale factor - A scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.
Common misconception
Pupils may want to use division instead of fractional scale factors.
Dividing by 2 gives the same result as multiplying by a half. However, the scale factor is defined as a multiplier, not a divisor.
To help you plan your year 7 maths lesson on: Describing an enlargement, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 maths lesson on: Describing an enlargement, 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 3 maths lessons from the Transformations unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Prior knowledge starter quiz
6 Questions
Q1.Enlargement is a transformation that causes a change of __________.
Q2.Two shapes are similar if the only difference between them is
Q3.Enlarging a shape means the shape will always get smaller.
Q4.Which properties are not invariant when a shape is enlarged?
Q5.Sam is going to triple the size of a rectangle. What will happen to the angles?
Q6.Lucas' rectangle has a length of 7 cm and a width of 2.6 cm. A similar rectangle has a length of 28 cm. What will its width be?
Assessment exit quiz
6 Questions
Q1.__________ factor is the multiplier between similar shapes that describes how large the image is compared to the object.
Q2.The of enlargement is the point from which a shape is enlarged.
Q3.The object has been enlarged to create the image. What is the scale factor?

Q4.The object has been enlarged to create the image. What is the value of $$x$$?

Q5.The object has been enlarged to create the image. What is the scale factor?

Q6.The object has been enlarged to create the image. What is the value of $$x$$?
