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Looks like the title got messed up in the process; the + sign was definitely not supposed to be 'and'.

People often use “and” to mean addition. “One and one make two”. So I think the title works fine.

I personally read it as 0.1 and 0.2 are both equal to 0.3000-whatever. Maybe it's because English is my second language.

"and" as a conjunction is sometimes used to mean "plus". As in "two and two make four."