Whole Numbers

What is Whole Number; symbol and representation of Whole Number on Number line?

If a is a whole number such that a+a=a , then a= ?

Dividing a decimal by a whole number

Multiplication of a decimal by a whole number

Every whole number is the successor of another whole number.

There is a whole number which when added to a whole number, gives the number itself.

Property 10 is the smallest whole number and there is no largest whole number.

On adding 9 to the twice of a whole number gives 31. the whole number is

Property 2 Each whole number has one and only one successor.The successor of a whole number is the whole number just on its right on the number line.Also 0 is not the successor of any whole number.

Add the following : The smallest four-digit whole number, the greatest three-digit whole number and the smallest five-digit whole number.