Sure! Let's find the smallest 8-digit odd number using only odd digits. The odd digits available for our use are 1, 3, 5, 7, and 9.
1. To form the smallest number, we need to use the smallest digits first. Among the available odd digits, the smallest digit is 1, followed by 3, and so on.
2. We need to make sure the number is 8 digits long.
3. The last digit must be an odd digit to ensure the overall number is odd.
Let's start placing the digits from the smallest to the largest, keeping in mind that we need a total of 8 digits.
1. Start with the smallest digit and repeat it if necessary while constructing the smallest number:
- First digit: 1
- Second digit: 1
- Third digit: 3
- Fourth digit: 3
- Fifth digit: 5
- Sixth digit: 5
- Seventh digit: 7
- Eighth, and last digit: 7
By placing these digits in ascending order and ensuring the last digit is an odd one (which, in this case, is 7), we can form the smallest possible 8-digit odd number.
Thus, the smallest 8-digit odd number using all odd digits is:
11335577
