yes!
Any number that can be expressed as a ratio (or fraction) of two non-zero integers is a rational number.
So a whole number (n), can be expressed as (n/1)
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56 is a rational whole natural number. Or to put it another way: 56 is a Natural number, but as all natural numbers are also whole numbers 56 is also a whole number, but as all whole numbers are also rational numbers 56 is also a rational number. Natural numbers are a [proper] subset of whole numbers; Whole numbers are a [proper] subset of rational numbers. The set of rational numbers along with the set of irrational numbers make up the set of real numbers
No. No irrational numbers are whole, and all whole numbers are rational.
The set of rational numbers includes all whole numbers, so SOME rational numbers will also be whole number. But not all rational numbers are whole numbers. So, as a rule, no, rational numbers are not whole numbers.
the greatest number that is an integer and rational number but is not a natural or whole number is -1
No.