# Mathematics / Year 1 / Number

Version 9
Curriculum content descriptions

add and subtract numbers within 20, using physical and virtual materials, part-part-whole knowledge to 10 and a variety of calculation strategies (AC9M1N04)

Elaborations
• using drawings, physical and virtual materials and number combinations within \(10\) to add and subtract collections to \(20\)
• adding and subtracting numbers within \(20\), using a variety of representations and strategies such as counting on, counting back, partitioning and part-part-whole knowledge of numbers to \(10\); for example, using partitioning and combining \(7+5=7+3+2=10+2=12\)
• developing and using strategies for one-digit addition and subtraction based on part-part-whole relationships for each of the numbers to \(10\) and subitising with physical and virtual materials; for example, \(8\) and \(6\) is the same as \(8\) and \(2\) and \(4\)
• representing story problems involving addition and subtraction of numbers within \(20\) using a Think Board, recognising and using + and â€“ symbols and the equal sign to represent the operations of addition and subtraction; showing and explaining the connections between any materials used using the language of plus and minus, and the numbers within the story problem
• creating and performing addition and subtraction stories told through First Nations Australiansâ€™ dances
General capabilities
• Numeracy Numeracy
ScOT terms

Subtraction,  Modelling (Mathematical),  Number operations,  Addition

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