Year 7 - Maths
Describing an enlargement
Transformations
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit introduces pupils to shape tranformations: enlargements, rotations, reflections and translations both by hand and with technology.
Lesson Summary
You will learn to understand the minimum information required to describe an enlargement.
Key Notes
- 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.
Vocabulary To Learn
- 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 Mistakes To Avoid
- Pupils may want to use division instead of fractional scale factors.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The scale factor is the multiplier. The centre of enlargement defines where the image will be placed in relation to the object.
2. Use this key word in a maths sentence and explain it clearly. 'Centre of enlargement'
The centre of enlargement is the point from which a shape is enlarged. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may want to use division instead of fractional scale factors. Correction: Dividing by 2 gives the same result as multiplying by a half. However, the scale factor is defined as a multiplier, not a divisor.
More Lessons In This Unit
- Checking understanding of basic transformations Study Guide
- Describing a reflection Study Guide
- Describing a rotation's direction and size Study Guide
- Describing a translation Study Guide
- Enlarging objects Study Guide
- Introduction to enlargements Study Guide
- Introduction to reflections Study Guide
- Introduction to rotations Study Guide
- Introduction to translation Study Guide
- Investigating transformations with Desmos Study Guide
- Investigating transformations with GeoGebra Study Guide
- Problem solving with transformations Study Guide
- Reflecting objects Study Guide
- Rotating objects Study Guide
- Transformed objects Study Guide
- Translating objects Study Guide
- Understanding the centre of rotation Study Guide
Browse all guides in the Year 7 Maths guide library.