# Enlargement by a non-integer scale factor

## Lesson details

### Key learning points

1. In this lesson, we will learn how to enlarge shapes by a non-integer scale factor. It would be helpful if you could have squared paper and a ruler for this lesson.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 3 Questions

Q1.
A shape is enlarged by an integer scale factor more than 1. What does not change from the object to the image?
The area of the shape
The perimeter of the shape
The side lengths
Correct answer: The size of the interior angles
Q2.
A square is enlarged by a scale factor of 3. The object had side length 4cm, what is side length of the image?
120cm
1cm
3cm
Q3.
A regular pentagon has been enlarged by scale factor 5. The side length of the image is 35mm, what is the side length of the object?
175mm
17mm
6mm

## Exit quiz

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### 3 Questions

Q1.
Which of these statements best describes a 'non-integer'?
Correct answer: A fraction or decimal
A negative number
A whole number
Q2.
A square has side length 12cm. It is enlarged by scale factor 2/5. What is the side length of the image?
10cm
2.4cm