take any number and divide it by the 9's as long as the number has digits and you will create an infinite repeating decimal of that number.

for instance 123/999 = 0.123123123...

or 1/9 = 0.111111111...

or 100/999 = 0.100100100100100

you get the point, it creates the infinite decimal of the number.

now lets see the infinite decimal of 9's by the same method:

9/9 = 1

fin