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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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Q: What are some examples of a fraction but not a rational number?
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What are some examples of rational numbers?

1.5 is a rational number because it can be written as the ratio 3/2 7 is a rational number because it could be written as the ratio 7/1 3/4 is a rational number because it could be written as a fraction


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Some real numbers can be expressed as a rational fraction.


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All integers and fractions are rational numbers whereas an irrational number can't be expressed as an integer or a fraction.


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