Find the 10 digit Number

A ten digit number which have all the digits from 0-9 only once in some combination.  The number is divisible by 10, if the digits of the number are removed one at a time from the right the number remaining is divisible by 9,8, 7, 6, 5, 4, 3, 2 and 1. Find the ten digit number.

1-100 How many digits?

A book having 1 to 100 pages.  How many digits are used to number the pages?