Well- by numbers, obviously! However, some numbers can be expressed in maths via equations or combinations of different numbers that have to be calculated to reveal what the number actually is. It's a bit like a code-cracking game.
Mathematics also uses a whole range of symbols that each have a meaning, to cut down on the use of words as a means of expression and save space- many of these symbols were devised in ancient Greece by the mathematical scholars there.
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Mr.carl f gauss toldmaths is queen of science and theory of numbers is queen of maths
There is no end to the numbers of maths and there are many classifications of numbers, like primes, fractions, even, odd, positive, negative and others.
The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.
Numbers are the main thing in Maths.