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- ?Lv 73 years agoFavorite Answer
It's just another way of abbreviating mathematics. Math is a straight up truncation of the word whilst maths follows the "rules" that a plural is marked in the abbreviation, like nos is an abbreviation for "numbers" (no = singular), even if we now think of mathematics in the singular. They're just conventions that got standardised differently. Both versions have a long history.
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