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Yes it is. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.

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Q: Is the difference of any 2 rational numbers a rational number?

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Rational numbers are numbers that can be written as a fraction. Real numbers are any number, including irrationals.

There are [countably] infinite rational number between any two rational numbers. There is, therefore, no maximum.

Any number is NOT rational. In fact, there are more irrational numbers than there are rational.

They can be but in general any number that can be expressed as a fraction is a rational number

The sum of any finite set of rational numbers is a rational number.

They all are rational numbers

In between any two rational numbers there is an irrational number. In between any two irrational numbers there is a rational number.

In between any two rational numbers there is an irrational number. In between any two Irrational Numbers there is a rational number.

No. In fact, there are infinitely more irrational numbers than there are rational numbers.

Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction. Any number that is a fraction is not an integer, but rational.

Any number that can be expressed as a fraction is a rational number which includes whole numbers

The difference of two rational numbers is rational. Let the two rational numbers be a/b and c/d, where a, b, c, and d are integers. Any rational number can be represented this way. Their difference is a/b-c/d = ad/bd-cb/bd = (ad-cb)/bd. Products and differences of integers are always integers. This means that ad-cb is an integer, and so is bd. Thus, (ad-cb)/bd is a rational number (since it is the ratio of two integers). This is equivalent to the difference of the original two rational numbers.

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