# Mathematics – Multi-age – Year B – Unit 16

This two-week unit develops student knowledge and skills in understanding different situations where addition, subtraction, multiplication and division can be used.

Mathematics K-2 Syllabus © 2021 NSW Education Standards Authority (NESA) for and on behalf of the Crown in right of the State of New South Wales.

Students are provided opportunities to:

• investigate the 4 operations through problem solving
• explore the relationship between different operations and inverse operations
• engage in meaningful activities using repeated halving and doubling (Stage 1).

## Syllabus focus and content group

### Early Stage 1

##### Representing whole numbers – MAO-WM-01, MAE-RWN-01, MA1-RWN-01 MAE-RWN-02, MA1-RWN-02
• Instantly name the number of objects within small collections
• Use the counting sequence of ones flexibly
• Recognise number patterns
• Connect counting and numerals to quantities
##### Combining and separating quantities – MAO-WM-01, MAE-CSQ-01, MA1-CSQ-01, MAE-CSQ-02
• Model additive relations and compare quantities
• Identify part–whole relationships in numbers up to 10
##### Forming groups – MAO-WM-01, MAE-FG-01, MA1-FG-01, MAE-FG-02
• Investigate and form equal groups by sharing
• Record grouping and sharing

### Stage 1

##### Representing whole numbers A
• Represent numbers on a line
• Represent the structure of groups of ten in whole numbers
##### Representing whole numbers B
• Use counting sequences of ones and tens flexibly
• Form, regroup, and rename three-digit numbers
##### Combining and separating quantities A
• Use advanced count-by-one strategies to solve addition and subtraction problems
• Recognise and recall number bonds up to ten
• Use flexible strategies to solve addition and subtraction problems
• Represent equality
##### Combining and separating quantities B
• Represent and reason about additive relations
• Form multiples of ten when adding and subtracting two-digit numbers
• Use knowledge of equality to solve related problems
##### Forming groups A
• Count in multiples using rhythmic and skip counting
• Use skip counting patterns
• Model and use equal groups of objects to represent multiplication
• Recognise and represent division
##### Forming groups B
• Represent and explain multiplication as the combining of equal groups
• Model doubling and halving with fractions
• Represent multiplication and division problems