What is an odd number minus and odd number?

Answer 1

Always an even number. Zero is not considered to be positive or negative, but it is considered to be even.

zero is undefined. you can't measure nothing. ie it holds no value. aka not even/odd/pos/neg. aka nothing. thus, your answer is correct with the zero exception.

Answer

Well, an odd number is one that is not evenly divisible by two. Subtracting an odd number from another odd number results in an even number. The jury is out (above) on whether zero is even or odd.

Nine minus five is four; four is an even number

Fifteen minus seven is six; six is an even number

Nineteen minus three is sixteen; sixteen is an even number