• Mastery PD Materials

## Composition of numbers: 0–5

Spine 1: Number, Addition and Subtraction – Topic 1.3

### Introduction

Apply the partitioning structure to the numbers to five, and introduce children to new concepts such as subitising, ordinality and the bar model.

### Teaching points

• Teaching point 1: Numbers can represent how many objects there are in a set; for small sets we can recognise the number of objects (subitise) instead of counting them.

• Teaching point 2: Ordinal numbers indicate a single item or event, rather than a quantity.

• Teaching point 3: Each of the numbers one to five can be partitioned in different ways.

• Teaching point 4: Each of the numbers one to five can be partitioned in a systematic way.

• Teaching point 5: Each of the numbers one to five can be partitioned into two parts; if we know one part, we can find the other part.

• Teaching point 6: The number before a given number is one less; the number after a given number is one more.

• Teaching point 7: Partitioning can be represented using the bar model.

• Primary
• KS1
• Year 1