A rational number is a number that can be expressed as a fraction. For example, the number 5 is a rational number because as a fraction it is 5/1. The number 0.5 is a rational number because as a fraction it is 1/2. The square root of 3 is not a rational number, as it can not be expressed as a simple fraction.
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Natural numbers Integers Rational numbers Real numbers Complex numbers
0 and 1.
In many books on mathematics for pupils aged around 10 upwards.
In mathematics, nothing is beyond infinity.There are, in certain technical areas of mathematics there are various "measures" of infinity and so some "infinite" entities are greater than others, e.g. there are more irrational numbers than rational numbers.
All rational numbers are real numbers.