Question

is every natural number, whole number and integer a rational number

Answer 1

yes it is correct. a rational number contains all of these stated above.

Answer 2

natural number like 5,14, 26
                            these have denominator 1
                              5/1, 14/1, 26/1

whole no.s like  0, 5, 9
                            these have denominator 1
                              0/1, 5/1, 9/1

integers like -5, -1, 5
                            these have denominator 1
                              -5/1, -1/1, 5/1