A number divided by 0.5 is equivalent to multiplying by 2. What is the law in mathematics?

A number divided by 0.5 is equivalent to multiplying by 2. What is the law in mathematics?

A number divided by 0.5 is equal to a number divided by 1 / 2, which is equal to a number multiplied by 2; the rule is that multiplication is the inverse operation of division. Fractional division, 0.5 = 1 / 2, divided by a number is equal to the reciprocal of the number multiplied by the number