Question

Does -20 belong to whole numbers integers and rational?

Answer 1

`-20` is in all those sets. See explanation.

Explanation:

A whole number (also called integer) is a number which has no fraction part (i.e. it has only digits and may also have a minus sign).

A rational number is any number which can be represented as a quotient of 2 integer numbers. This number can be written as `-20=(-20)/1`. So it is a rational number