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Apply place value to partition, rearrange and regroup numbers to at least 10 000 to assist calculations and solve problems (ACMNA053)

- recognising that 10 000 equals 10 thousands, 100 hundreds, 1000 tens and 10 000 ones
- justifying choices about partitioning and regrouping numbers in terms of their usefulness for particular calculations

Place value, Associativity