# Mathematics – Multi-age – Year B – Unit 9

This unit develops understanding and skills of forming groups and combining and separating.

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.

In this unit students will learn to:

• choose and evaluate strategies to combine, separate, and form groups
• use concrete materials, drawings, words, numerals and/or symbols to describe and explain mathematical operations
• understand that the order in which 2 quantities are combined does not change the result
• explore the inverse relation between addition and subtraction (Stage 1)
• apply knowledge of related facts (number combinations to 10 and/or 20)
• use repeated addition to solve multiplication problems.

### Early Stage 1

##### Representing whole numbers – MAO-WM-01, MAE-RWN-01, MAE-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, 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, MAE-FG-02
• Copy, continue and create patterns
• Investigate and form equal groups by sharing
• Record grouping and sharing
##### Data – MAO-WM-01, MAE-DATA-01, MAE-DATA-02
• Organise objects into simple data displays and interpret the displays
• Part A: Ask questions and gather data
• Part A: Represent data with objects or drawings that describe the displays

### Stage 1

##### Representing whole numbers – MAO-WM-01, MA1-RWN-01, MA1-RWN-02
• Use counting sequences of ones with two-digit numbers and beyond
• Part A: Continue and create number patterns
• Part A: Represent numbers on a line
• Part A: Represent the structure of groups of ten in whole numbers
• Part B: Use counting sequences of ones and tens flexibly
• Part B: Form, regroup, and rename three-digit numbers
##### Combining and separating quantities– MAO-WM-01, MA1-CSQ-01, MA1-CSQ-02
• Part A: Use advanced count-by-one strategies to solve addition and subtraction problems
• Part A: Recognise and recall number bonds up to ten
• Part A: Use flexible strategies to solve addition and subtraction problems
• Part A: Represent equality
• Part B: Form multiples of ten when adding and subtracting two-digit numbers
• Part B: Use knowledge of equality to solve related problems
##### Forming groups– MAO- WM-01, MAE-FG-01
• Part A: Count in multiples using rhythmic and skip counting
• Part A: Use skip counting patterns
• Part A: Model and use equal groups of objects to represent multiplication
• Part A: Recognise and represent division
• Part B: Represent and explain multiplication as the combining of equal groups
• Part B: Model doubling and halving with fractions
• Part B: Represent multiplication and division problems
##### Geometric measure – MAO-WM-01, MA1-GM-01, MA1-GM-02
• Part A: Position: Follow directions to familiar location
• Part A: Length: Measure the lengths of objects using formal and informal units
• Part B: Position: Explore simple maths of familiar locations

#### Data – MAO-WM-01, MAE-DATA-01, MAE-DATA-02

• Part A: Ask questions and gather data
• Part A: Represent data with objects and drawings and describe the displays