Jacob Baltuch wrote: >>Actually the digits of any number that is a multiple of 9 will have a >>sum of 9 as well. > >Not true: 9 * 11 = 99 But if you proceed to add the digits until you're left with one, it *is* true: 99 = 9 + 9 = 18 = 1 + 8 = 9 Martin Gansten