1×2

1×2 is a simple arithmetic expression that denotes the product of the numbers 1 and 2. In standard base-10 arithmetic, 1×2 equals 2, and the expression is read as “one times two.” The product illustrates the multiplicative identity property: multiplying any number by 1 leaves that number unchanged, so 1×a = a for any a.

Notation and context: The multiplication sign ×, commonly read “times,” is widely used to denote multiplication. Alternatives include the dot · and the asterisk *. The × symbol became a standard notation in early modern mathematics, though its exact historical origin is not uniformly agreed upon. It is widely recognized today across many countries and mathematic disciplines.

Beyond single numbers, 1×2 also refers to dimensions in linear algebra: a 1×2 matrix is a row vector with one row and two columns. Such a matrix can participate in matrix products; for example, multiplying a 1×2 matrix by a 2×1 matrix yields a 1×1 matrix, i.e., a scalar, equal to the dot product of the row and column. In geometry, a 1-by-2 rectangle has area 2 square units.

Applications and usage: In computing and everyday contexts, 1×2 often appears as a size or dimension, such as layout grids or tile measurements. It is used to describe products, packaging, and screen or image dimensions, where the order (width by height) indicates the intended orientation.