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Look Carefully Above!
The [3] [6] [12] are all
Double cousins!
Look Carefully again!
The {9} on the side is a triple cousin of the {3}!
Look Carefully! The [1] [2] [4] [8] are all Double cousins!
Marcus' Mathematical Fluency
Fluency - Multiplication Tables
Fluency - Doubling & Halving
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