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Add/subtract multiples of 10
Spider's Workout
Adding and subtracting 10 using a 1-100 grid
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