Zero is a rational number and an integer.
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Divide a non-zero integer by a non-zero integer.
Yes, that is how a rational number is defined.
5 is a natural number, as it is an integer greater than zero. It is a whole number, an integer, and a rational number.
A rational number can be expressed as a fraction or ratio of two integers. Zero is an integer. Therefore, zero is a rational number EXCEPT, that the denominator of a rational number cannot be zero. You can't divide by zero.
Yes, zero is a real number. It is not a counting number, but it is an integer, a rational number, and a real number.