lets try 7 number 7 is a natural number, whole number any natural is a whole number any natural and whole number si an integer so 7 is also a integer. any number that is natural, whole and integer is a rational number. we can write 7 as 7/1 we can write any integer as that number / 1 if it is rational it cannot be irrational. it is also going to be real we have -15. it is not a natural number natural number are positive integers only it is not a whole number it is an integer, it is the opposite of +15 it is rational as it can be written as -15/1 and because it is rational it cannot be irrational it is also real.