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Surely it isn't that rare? I can track about 8 digits total while doing mental mul/div, and I don't think of that as anything special.

I’m probably just an idiot, but I am absolutely terrible and anything that requires me to retain information in my head for a calculation.

So you could multiply or divide two four digit numbers by visualizing them?

To me that is pretty incredible!

How do you figure? Just the two inputs would take up all 8 digits, but you need to keep track of a bunch of intermediate results too.

Yeah 4x4 would be a bit much, 3x3 is doable, 3x2 is easy.