# Explain that different lengths can be composed additively and multiplicatively

I can explain that different lengths can be represented as addition and multiplication.

# Explain that different lengths can be composed additively and multiplicatively

I can explain that different lengths can be represented as addition and multiplication.

## Slide deck

## Lesson details

### Key learning points

- Partitioning 100 in different ways can be used to compose lengths.
- There are four 25s in 100 so there are four 25cm lengths in 1m.
- 1m divided into four equal parts is 25cm or 0.25m.
- 1m divided into five equal parts is 20cm or 0.2m.

### Common misconception

Pupils think that when a whole is divided into x parts, they need to have x interval markers.

Encourage pupils to make connections between the bar model and the number line, drawing attention to where each whole has been divided.

### Keywords

Common - Something is common when it is frequently used or it occurs regularly.

Compose - Larger numbers can be composed of smaller numbers.

Partition - The act of splitting an object or value down into smaller parts.

### 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

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## Worksheet

## Starter quiz

### 6 Questions

each part has a value of 50

each part has a value of 25

each part has a value of 20.

## Exit quiz

### 6 Questions

each part has a value of 0.5 m.

each part has a value of 0.25 m.

each part has a value of 0.2 m.