A rational number is a number that can be represented as a quotient of two integers, where the second isn't equal to zero.
As 1 and 3 are both integers, 1 divided by 3 is rational.
-1 divided by 2 is a rational number because it can be expressed as a fraction in the form of -1/2
A rational number is one that can be written as a ratio - or fraction - between two integers. All integers can be written in the form (integer) / 1, and are therefore rational.
0.1429
3.3333
Yes.
0.6667
Any number, rational or irrational, can be divided by 1 and itself. A number divided by 1 does not change, and a number divided by itself is equal to 1. The definition of a rational number is a number which can be expressed as the ratio of two integers. So there is division involved, but not the kind you thought.
Any already rational number
It is. A rational number is either an integer or a recurring decimal. An irrational number would be the square root of 2. There are also complex numbers that aren't rational or irrrational.
0.6667
0.4286
The expression written in the question is the rational expression.