I wonder if there's mental adding algorithm that doesn't need a carry. I noticed it's the first thing slowing me down.
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o hai! if carry slows you, why not train Dual N-Back? there's BrainWorkshop for desktop and Brain N-Back for Android.
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not really a memory problem, more the difference between immediately seeing the relation between 124 and 248 vs. 78 and 156.

