The answer to 18 x 5 is 90. The statement 18 x 5 is a multiplication function, and the answer to a multiplication function is called a product.
The multiplication function is defined as the sum of one number when added to itself the amount of times indicated by the second number. For example, in 18 x 5, the solution can be found by adding together the number 18 a total of five times, as in 18 + 18 + 18 + 18 + 18, which equals 90. The function can similarly be solved by adding the number five to itself 18 times, resulting in the same answer of 90.