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A rational number is any real number which can be expressed as a fraction m/n, where m and n are integers, with n non-zero.
Each of these is a rational number, since they can be expressed as:
-112/10, 100/3, -417/100, 261/10, -8/13
The term whole number is used differently by different authors. It may mean:
* Natural number, a.k.a. counting numbers, including 0
* Natural number, not including 0 (although this usage seems to be rare)
* Integer, positive and negative numbers
These numbers are not whole, integers, or natural numbers.
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Is 0.333 a rational number?
Yes - expressed as a proper fraction, 0.333 is equal to 333/1000 or three hundred and thirty-three thousandths.
Is the product of a rational number and a rational number a rational number?
yes
Is a rational number multiplied a rational number rational?
Yes.
Is the number 17.5 a rational number?
yes
Which number can be multiplied to a rational number to explain that the product of two rational numbers is rational?
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
