Oh, I wasn't offended or anything, doubtfulguest. No worries!

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literally, that's why DD learned fractions - because she had to use the smaller cups to get in there.

Well...most kids would not know how to add fractions with different denominators from doing this. What they would learn was "I have to use the littler cup." Not saying you were hothousing, though. Combination of very bright child and parent who explains stuff.