# Enlargement and similarity

### Term 3 starting in week 1 :: Estimated time: 2 weeks

• Recognise enlargement and similarity
• Enlarge a shape by a positive integer scale factor
• Enlarge a shape by a positive integer scale factor from a point
• Enlarge a shape by a positive fractional scale factor
• Work out missing sides and angles in a pair of given similar shapes

For higher-attaining pupils:

• Enlarge a shape by a negative scale factor
• Solve problems with similar triangles
• Explore ratios in right-angled triangles

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## Lesson Starters

Here are some suggestions for whole-class, projectable resources which can be used at the beginnings of each lesson in this block.

### 1st Lesson

#### Star Wars Day

Estimate the size of an alien given the size of their hand. This could be an introduction to scale factors.

### 2nd Lesson

#### Analogies

Make more of analogies to help remember mathematical concepts.

### 3rd Lesson

#### Consecutive

Three consecutive numbers multiplied together give a given product. Pupils are asked to figure out what the numbers are.

### 4th Lesson

#### Khmer's Homework

Check a student's homework. If you find any of the answers are wrong write down a sentence or two explaining what he did wrong.

### 5th Lesson

#### Oblongs

Find the dimensions of a rectangle given the perimeter and area.

### 6th Lesson

#### Rounding 1dp

Round off the given numbers to 1 decimal place then add the answers together.

Some of the Starters above are to reinforce concepts learnt, others are to introduce new ideas while others are on unrelated topics designed for retrieval practice or and opportunity to develop problem-solving skills.

White Rose Resources
 End of block assessments provide a quick progress check at the end of each block of learning to make sure students have understood the content covered. This Scheme of Learning was produced by White Rose Maths and is used here with permission granted on 30th June 2021.

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