Zero (0) is a rational number.
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No, a rational number must be a whole number, for example 40 and 5643 and 948.
Yes, negative numbers can most certainly be rational. A rational number is simply a number which can be expressed as a fraction. An example of a negative rational number is: -1/2
No. All rational numbers are real. Rational numbers are numbers that can be written as a fraction.
37.569 is one example.
Given any two integers, x and y, such that y is not 0, then x/y is a rational number. So for example, 3476/43 is a rational number.