We look at the division of 231585 by 1 
The aim is to understand the frequency of 1 in 231585.

On to step 1:
1 goes into 2 2 times with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 0 after subtracting 2 from 2.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 1

Moving on to step 2:
1 goes into 3 3 times with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 23.0
The remainder is 0 after subtracting 3 from 3.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 1

Going ahead to step 3:
1 divided by 1 is 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 231.0
Subtract 1 from 1 to get 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 1

Going ahead to step 4:
The number 1 fits into 5 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 2315.0
The remainder is 0 after subtracting 5 from 5.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 1

Moving on to step 5:
The number 1 fits into 8 8 times, leaving a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 23158.0
If we take 8 away from 8, we end up with 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 1

Moving on to step 6:
1 goes into 5 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 231585.0
If we take 5 away from 5, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
When dividing 0 by 1, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 231585.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
The number 1 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 231585.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 231585.0 with a remainder of 0.0.