0×21

0×21, read as zero times twenty-one, is a product that results from multiplying zero by twenty-one. In standard arithmetic, the value is 0. This is an example of the zero property of multiplication: the product of zero and any number is zero. Thus 0×21 = 0 and 21×0 = 0.

This property holds for integers, rational numbers, real numbers, and complex numbers, and it is preserved in most mathematical systems that define multiplication. The zero element acts as an absorbing element for multiplication, meaning that multiplying by zero yields zero regardless of the other factor.

In practical contexts, 0×21 is used to illustrate simplification rules in algebra and to check computations in programming and numerical methods. In programming languages, the expression typically evaluates to the integer 0 (or the floating-point 0.0 in languages that distinguish numeric types), reflecting the same mathematical rule.

Understanding 0×21 helps in recognizing how multiplication interacts with zero and supports broader conclusions about expressions that include a zero factor.