Number 1089-Rejoinder

I had mentioned in an earlier blog dealing with number 1089 that we should choose the 3 digit numbers such that in the first step of subtraction we do not get a 2 digit number.In fact you will find that the only 2 digit number which occurs is always 99.This should be treated as the 3 digit number 099 and so on reversal of digits you get 990.The next step then gives you 990+099=1089 as in all other cases.There is thus no exception.