# Checking and securing understanding of sharing in a ratio

I can use a ratio fluently in the context of sharing.

# Checking and securing understanding of sharing in a ratio

I can use a ratio fluently in the context of sharing.

## Lesson details

### Key learning points

- Bar models can help to represent a situation.
- It is important that the parts are equal, otherwise the ratio is not represented correctly.
- A ratio table can also be used to help show the multiplicative relationship.
- Both representations help to expose the structure.
- Once the structure is understood, the representations will not be needed.

### Common misconception

Procedural understanding of sharing in a ratio where pupils add the parts, divide the amount by this and then multiply by each part without considering the information in the question.

In the lesson encourage pupils to look for keywords in the question which indicate if the amount given is the total, one part or the difference. The use of a bar model to display the information can also be used to help pupils.

### Keywords

Ratio - A ratio shows the relative sizes of two or more values and allows you to compare a part with another part in a whole

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

Loading...

## Starter quiz

### 6 Questions

40 : 100

20 : 5

30 : 35

100 : 40

30 : 45

4

$$\frac{3}{5}$$

$$\frac{1}{4}$$

$$\frac{5}{3}$$