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Because an integer j can be written as j/1. This is obviously rational, but reduces to j.

Q: Why is an integer also a rational number?

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Yes and yes. It is an integer and so it is also a rational number.

A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.

No. To be a rational number it must be an integer over another integer. π is not an integer, nor can it be made into an integer by multiplying it by another integer, thus one twelfth of π is not a rational number.

An integer is any number which can be either positive and negative but not a fractional number. It is also a whole number. Examples are -1,256, -589, -1, 0, 1, 569, 5,236. It is always a rational number. By definition, a rational number is the division of two integers, where the divisor is not zero. Since the divisor is 1 when the number is an integer, then all integers are rational.

It is real, rational, integer and a whole number.It is not an irrational number nor an interger - there is no such thing!

Related questions

Every integer is also a rational number and a real number.

Yes and yes. It is an integer and so it is also a rational number.

A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.

Every integer is a rational number.

It is a rational number, not an integer.

A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.

It is not an integer but is a rational number.

Yes and it is also a prime number

A rational number.

It can be written as a fraction, so it is rational. It is not an integer, whole number or irrational.

No but every integer is a rational number and numbers that can be expressed as fractions are also rational numbers

A rational number is either an integer or a fraction.