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'Arithmetic' is a 'mass noun', ie, it is the collective word for something which cannot be presented as a discrete, definitive article. By that, I mean you can't say "An arithmetic" as in, trying to present it as a single entity, without any further qualifiers (such as 'an arithmetic problem').

Therefore there is no plural or singular form. 'Arithmetics' is another mass noun with the same meaning.

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14y ago

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