If a decimal can be expressed as a fraction then it is a rational number
as for example 0.75 = 3/4
Also, if the decimal ever ends, or is a never ending repeat of the same digit
or group of them, then it's a rational number.
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A rational number can be expressed as a ratio p/q of two integers where q > 0. Divide the numerator p by the denominator q. The answer is the decimal representation of the rational number.
It depends. A terminating decimal is a rational number. A decimal which, after a finite number of places, becomes a repeating (or recurrent) decimal is also a rational number. A decimal that is not terminating, nor [eventually] settles into a recurring pattern is not a rational number. Note that the decimal need not become recurring immediately.
A decimal rational number can be expressed as a fraction A decimal irrational number can not be expressed as a fraction
Any rational number is either a repeating decimal, or a terminating decimal.
A decimal need not be a rational. A non-terminating, non recurring decimal is an irrational number. Only a terminating decimal or a recurring decimal is rational and that is because such a number can be expressed as a ratio of two integers.