Theory:

The closure property of integer states that while operating addition with two or more integers, the result of the operation is also an integer.
While doing the operation on integer if the result of the operation is an integer, then we can say that it satisfy the closure property.
The result of the addition of any two integers is always an integer.

Consider \(a\) and \(b\) are two integer then:
 
\(a + b\) is an integer.
Example:
1 and 7 are two integers then, 1+7=8 is also an integer.
 
1 and 9 are two integers then, 1+9=10 is also an integer.
Therefore the closure property of whole numbers states that while operating addition with two or more whole numbers, the result of the operation is also a whole number.