4pp. Doubling and halving 2-digit numbers, x10 and dividing by 10, extending to x20 and dividing by 20. Use with “Doubling, Halving 2 Digit Numbers Mentally” [PowerPoint TBM501]

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

ACMNA130

Multiply and divide decimals by powers of 10

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