If third grade mathematicians remember the doubling rule in addition (2 + 2, 3 + 3, etc...) then they will be experts at the 2s tables! This morning I reminded the third graders that multiplying by 2 is the same as saying two groups of... This is of course the same as adding our doubles.
For example, 2 x 4 is like 4 + 4 which equals 8.
This should make studying the 2s tables much easier, because most kids already have these memorized!
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