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Understand doubles/halves to 20
In-depth Investigation: Double or halve? from nrich.maths.org
Understand hours, minutes, seconds
In-depth Investigation: Order, Order! from nrich.maths.org
Understand multiplication as sets; recognise patterns
In-depth Investigation: Clapping Times from nrich.maths.org
Use facts to add several numbers
In-depth Investigation: Number Balance from nrich.maths.org