Crossword Genius

Science of numbers (5)

Ross

I think it could be either:

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5

11

(Other definitions for maths that I've seen before include "Algebra, geometry, calculus etc (abbr)" , "Adding and subtraction, etc" , "It concerns numbers, in short" , "The science of number, quantity and space" , "Arithmetic etc" .)

I've seen this clue in The Guardian.
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