AC9M1N04 Year 1 Mathematics

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

Elaborations

• • Elaboration using drawings, physical and virtual materials and number combinations within 10 to add and subtract collections to 20
• • Elaboration 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
• • Elaboration 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
• • Elaboration representing story problems involving addition and subtraction of numbers within 20 using a Think Board, recognising and using + and – 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
• • Elaboration creating and performing addition and subtraction stories told through First Nations Australians’ dances