231349 ÷ 15 
The aim is to understand the frequency of 15 in 231349.

Advancing to step 1:
If we divide 2 by 15, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 15

Moving on to step 2:
23 divided by 15 is 1 with a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 15 from 23 to get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 15

Moving on to step 3:
The number 15 fits into 81 5 times, leaving a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 6 after subtracting 75 from 81.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 15

Advancing to step 4:
The number 15 fits into 63 4 times, leaving a remainder of 3.
The next digit of our result is 4. 
Result so far: 154.0
Subtract 60 from 63 to get 3.
Grab the next digit (4) from the dividend, add it to 3, then carry on: 34 / 15

On to step 5:
34 divided by 15 is 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 1542.0
Deduct 30 from 34 and we're left with 4.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 15

Let's proceed to step 6:
49 divided by 15 is 3 with a remainder of 4.
The next digit of our result is 3. 
Result so far: 15423.0
If we subtract 45 from 49, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
When dividing 40 by 15, we get 2 with a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 15423.2
Subtract 30 from 40 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
100 divided by 15 is 6 with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 15423.26
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
If we divide 100 by 15, we get 6 and a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 15423.266
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 15423.266, with a leftover of 0.001.