Multiplying large numbers by 5. First multiply by 10, then halve it.
ACMNA076
Develop efficient mental and written strategies and use appropriate digital technologies for multiplication and for division where there is no remainder
ACMNA100
Solve problems involving multiplication of large numbers by one- or two-digit numbers using efficient mental, written strategies and appropriate digital technologies
ACMNA291
Use efficient mental and written strategies and apply appropriate digital technologies to solve problems
ACMNA123
Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers
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