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Add/subtract multiples of 0.1, 0.01, 0.001
In-depth Investigation: Sometimes We Lose Things from nrich.maths.org.
Add/subtract multiples of 0.1/0.01
In-depth Investigation: Dicey Operations in Line (adapt Game 1) from nrich.maths.org.
Add/subtract multiples of 10
In-depth Investigation: The Number Square! from nrich.maths.org