9x2

9x2 commonly denotes the product of 9 and 2, yielding 18. In elementary arithmetic, multiplication is the process of repeated addition; thus 9×2 equals 9 + 9, which is 18, and equivalently 2 added to itself nine times also gives 18.

Notation and typography vary. The symbol × is the conventional multiplication sign in mathematics. The plain lowercase x is often used in informal writing or text, but can be confused with a variable or with the multiplication sign in different fonts. In programming, the asterisk (*) is typically used for multiplication, so expressions like 9*2 appear in code.

Properties and interpretations. Multiplication is commutative: 9×2 = 2×9 = 18. It is a basic operation that scales numbers and participates in larger algebraic rules, such as the distributive property over addition (for example, 9×(2+3) = 9×2 + 9×3).

Geometric and matrix interpretations. A 9 by 2 rectangle has area 18 square units. A 9×2 matrix has 9 rows and 2 columns and contains 18 elements, illustrating how the same numeric product appears in different mathematical contexts.

See also: multiplication, product, area, matrix.