You can put this solution on YOUR website! To find the smallest even 3-digit number, start from the first and check to see if it is even.
100. It is even. the smallest 3-digit even number is 100.
To find the largest odd 3-digit number, start from the last and check to see if it is odd.
999. It is odd. The largest 3-digit odd number is 999.
To find the difference, subtract the lower from the higher.