A "rational" number is anything that can be expressed as a ratio, or fraction. So 0.5 is "rational", because it is the fraction 1/2. "Irrational" numbers can't be expressed as a fraction; for example, the irrational number "pi", which is APPROXIMATELY equal to 3.1416.
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A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.
It is a rational number, in decimal form. In the form of a ratio, it is 11/100.
It is a rational number because it can be expressed as a fraction in the form of 75/1
-12 is the rational number. In the form of a ratio, it can be written as -12/1.
Since the number 3.33333 can be expressed in a fraction form, it is a rational number.