Myths about teaching can hold you back
- Year 7
Enlarging objects
I can enlarge objects using information about the centre of enlargement and scale factor
- Year 7
Enlarging objects
I can enlarge objects using information about the centre of enlargement and scale factor
Lesson details
Key learning points
- Each length in the shape is multiplied by the scale factor
- Each vertex in the object is a given distance from the centre of enlargement
- This distance is also multiplied by the scale factor to give the distance of the image's vertex
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 initially be unsure when enlarging shapes on different background in Q2 of Task B.
Stress that they can use the same methods as for square or plain backgrounds (e.g. using a ruler, counting units along gridlines).
To help you plan your year 7 maths lesson on: Enlarging objects, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 maths lesson on: Enlarging objects, 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
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Scale factor is the between similar shapes that describes how large one shape is compared to the other.
Q2.The invariant point from which an object is enlarged is known as the _________________.
Q3.P has been enlarged to create A. What is the scale factor?

Q4.P has been enlarged to create A. What is the value of $$a$$?

Q5.P has been enlarged to create B. What is the scale factor?

Q6.P has been enlarged to create B. What is the value of $b$$?

Assessment exit quiz
6 Questions
Q1.Which of these is NOT a method for enlarging an object?
Q2.When enlarging, an image and object can overlap.
Q3.The shape is being enlarged by a scale factor of $$1\over2$$. The centre of enlargement is marked with a cross. What are the new coordinates of B?
