A rational number is a fraction with an integer in the numerator, and a non-zero integer in the denominator. If you consider pi/2, pi/3, pi/4 (common 'fractions' of pi used in trigonometry) to be 'fractions', then these are not rational numbers.
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There are many different kinds of fractions, some rational and some irrational.
All integers and fractions are rational numbers whereas an irrational number can't be expressed as an integer or a fraction.
There are infinitely many rational number between 13 and 25. Some examples:13.0000001 13.0000001002 13.0000002
It is a prime number It is a rational number It is an odd number It is 11/1 as an improper fraction It is 11.0 as a decimal
Some real numbers can be expressed as a fraction, others cannot. Those that can be are called rational, and those that can't be are called irrational.