1080, 9989
1We can not start a three digit number with 0, so 1 is the smallest digit.
100,000
.1
1
In order to make the smallest possible number with a set of digits, you want the least valued number in the greatest valued place. For 5 digits, you would want the least digit, 0, in the ten thousands place. You would then want the second least digit, 3, in the thousands place, and so on. For the digits 0,3,5,7,9 the smallest possible number would therefore be 03,579 or 3,579.
The number that matches your criteria is... 998949
The smallest possible 9 digit number (assuming negatives are not allowed) is 102,345,678 in which 5 is in the thousands' place.
1000
The smallest digit in any place is always 0.
102, 010 2 in the thousands place is twice 1 in the tens place,
100,600
100