http://en.wikipedia.org/wiki/Adam_Ries
Okay, more RW. Before the publication of Adam Ries' book in germany, the
"simple" people (90%+) were mathematically dumb. In fact it was
letterpress, that first brought reading skill, then any other science in
broad. Of all science before, you only had a couple of handwritten
copies, or even only archimedes' original!!! So you could only teach it
to some elite, not to the world.
But still: Counting and sums... both do not really become harder, just because you may have high numbers.
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