Starting from the left, use the smallest possible digit for each position. Note that only four digits are given, so we can assume that we are free to choose the fifth digit. The first digit can't be "0", so use the next-smallest digit: "0". The next digits would be "169". For the final digit, add an additional zero.
0.12369
You get the largest number if you sort the digits, from largest to smallest.
It is -987654. The smallest POSITIVE number is 102345.
2034
100122 or, if negative numbers are permitted, -998877
Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.
1023
0.12369
You get the largest number if you sort the digits, from largest to smallest.
It is -987654. The smallest POSITIVE number is 102345.
012345 or -543210, if negative numbers are permitted.
5
2034
5
100122 or, if negative numbers are permitted, -998877
21123
The smallest number is 5,789. The largest is 98,750. The difference is 92,961.