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 20 October 2014

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# Number: Ratio

Ratio lesson plan

## KS3 Bitesize

### Objectives

• Pupils solve simple problems involving ratio and direct proportion

• AT2 level 5

### Resources

• Worksheet on Ratio
• Pre-prepared cards each with a different multiplication on it (3 x 3, 2 x 7, 6 x 6 etc)

### Teaching activities

#### Mental Starter

• A multiplication table card chase game in which each student calls out the product of the mutiplication on the previous student's card:
"You have 3x3.
I have 9. You have 2x7.
I have 14. You have 6x6...." etc.

#### Activity

1. Give out the worksheet.
2. Talk about the two examples and decide on the easiest way to go from one to the other.
3. Give the pupils time to finish the sheet, then discuss the questions.
4. The teacher will need to decide on the ability of the group and tailor the questions toward this.

#### Extension

• Dividing in a given ratio. The fraction of girls if the ratio of girls to boys is 1:4.

#### Plenary

• Race game:
Two pupils stand facing away from the board.
A question is written on the board behind them.
On the command of "Go!" they turn around and race to finish the question.
The winner faces a new challenger.

#### Homework

• A teacher-prepared sheet.