"Except... part of being a functional adult is understanding a little bit how math works. Everyone has to be able to add and subtract, if nothing else than to sanity-check what their calculator says. If they had no math at all and replaced all their math with push-buttons-on-your-calculator classes, they'd have to take it on faith that they didn't slip somewhere when pushing the buttons."
And a good chunk of the population has absolutely no qualms about accepting things on faith...
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There is no shame in not knowing; the shame lies in not finding out