-8
Take the smallest 6-digit even number, then subtract one from it.
11112
11112
The smallest negative one digit number is -9, and the smallest positive one digit number is either 0 or 1, I'm not sure about the positive.
The smallest six-digit number is 100000 (one hundred thousand), which is also an even number.
One
-9
The smallest odd positive number is 1 (one).
The smallest three digit number is 0.01. One less than that would be -1.01.
1111
1
12354.