text: # Multi-age K–2, mathematics, Year A – Unit 09
  
  Explore how collections of objects can be changed by adding more (combining) or taking some away (separating) in this two-week, multi-age sample unit.
  
  ## Syllabus
  
  Syllabus outcomes and content descriptors from the Mathematics K–10 Syllabus (2022) © NSW Education Standards Authority (NESA) for and on behalf of the Crown in right of the State of New South Wales, 2024.
  
  In this unit, students will learn to:
  
  • represent combining situations in different ways through the use of gesture, enactment, drawings, numbers and words
  • use symbols to describe mathematical quantities, actions, and relationships in efficient ways
  • understand that the order in which 2 quantities are combined does not change the result
  • recognise that when 2 collections have the same total, they are described as ‘equivalent in value’. Words such as ‘equal’, ‘equivalent’, and ‘is the same as’ can also be used.
  
  ## Syllabus focus area and content groups
  
  ### 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
  
  Non-spatial measure – MAO-WM-01, MAE-NSM-01
  
  Mass: Identify and compare mass using weight
  
  ### Stage 1
  
  Representing whole numbers – MAO-WM-01, MA1-RWN-01, MA1-RWN-02
  
  • Part A – 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
  
  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 – Represent equality
  • Part B – Use knowledge of equality to solve related problems
  
  Forming groups – MAO-WM-01, MA1-FG-01
  
  • Part A – Count in multiples using rhythmic and skip counting
  • Part A – Model and use equal groups of objects to represent multiplication
  • Part B – Represent and explain multiplication as the combining of equal groups
  
  Non-spatial measure – MAO-WM-01, MA1-NSM-01
  
  • Part A – Mass: Investigate mass using an equal-arm balance
  • Part B – Mass: Compare the masses of objects using an equal-arm balance
  
  ## Resource
  
  Category:
  
  • Combining and separating quantities
  • Forming groups
  • K-2
  • Mathematics (2022)
  • Non-spatial measure
  • Representing whole numbers
  • Unit