Questions on basic arithmetic involving numerical quantities only. Topics include factorization, divisibility, prime numbers, modular arithmetic etc. Questions involving variable values (other than the result of the operation) should be placed under the (algebra-precalculus) tag.
Arithmetic is defined as operations upon numbers using $4$ main operations along with many others:
addition - the sum of two numbers
subtraction - the difference of two numbers also defined as the addition of negative numbers
multiplication - the area of a rectangle with sides of lengths equal to the two operands
division - the number of times one number can be subtracted from another before equaling zero. Sometimes it will allow decimals and in other cases there will be a remainder left over when a number doesn't go into another evenly