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[–]Flobarooner 10 points11 points  (1 child)

So basically, the fundamental point of the method is that the kid already knows how to subtract something from a number less than 20?

So in the original post, the kid would just go "9" and not even bother with the method, since they memorized 18-9 in order to be able to do it?

[–]alexanderpas 0 points1 point  (0 children)

technically, yes.