A natural number is a positive counting number, ie, 0 1 2 3 4.
-1 -2 -3 and -4 are whole numbers but cannot be natural numbers as they are negative.
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A whole number series starts from zero with 1 digit difference, but a natural number series starts from 1 with 1 digit difference. for eg.- 5 is a natural number as well as a whole number. But zero is just a whole number and not a natural number.
All negative integers are whole numbers but not natural numbers. Mathematicians are not agreed about whether 0 is a natural number or not.
It is replacing the number by the whole number such that the difference between the number and that whole number is the smallest that it can be.
an integer is a whole number
There are no differences.