What exactly do you mean when you say "the opposite of a whole number" . . .
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The square root of 16 is 4 which is a whole number.
A whole number is called an integer. The opposite of a whole number is a negative integer. An example would be 4 and -4.
Call your number any variable, for example x. Then: "A number": x "The opposite of a number": -x "Is": the equal sign. "The opposite of a number is -9": -x = -9
Any fraction can be multiplied by a whole number so that the product is a whole number. Simply multiply the fraction (in rational form) by its denominator.
In math, it means any number that can't be written asone whole number divided by another whole number.