6.ACMNA123 Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers

addition_and_subtraction_strategies.pptx
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​Add and subtract whole numbers up to millions (Year 6 - G.1) 

6 Digit Addition

Subtraction- No Regrouping

Subtraction- May require Regrouping

Add and subtract whole numbers: word problems 

Part 2: Multiplication Investigation HERE