Property 1 If `a and b` (b not equal to zero) are whole numbers then `a -: b` (expressed as `a/b` ) is not necessarily a whole number.

Property 5 If ab and c are whole numbers such that a-b=c then b+c=a .

COMMUTATIVITY If a and b are any two whole numbers then a+b=b+a

Property 2 If a is any whole number then a-:1=a.

Are all whole numbers also whole numbers?

If the numbers a-b and a+b are twin primes then a and b are necessarily

CLOSURE PROPERTY If a and b are two whole numbers then their product a xx b is also a whole number.

Property 1 If a and b are two numbers such that a > b or a = b then a - b is a whole number. If a < b then subtraction a - b is not possible in whole numbers.

Property 5 Let ab and c be whole numbers and b!=0c!=0. If a-:b=c then b xx c=a

CLOSURE PROPERTY If a and b are two whole numbers then a+b is also a whole number.In other words the sum of any two whole numbers is a whole number or whole numbers are closed for addition.