We divide 131205 by 1
The aim is to understand the frequency of 1 in 131205.

Going ahead to step 1:
1 goes into 1 1 times with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 1 from 1 and we're left with 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 1

Going ahead to step 2:
1 can be fit into 3 3 times, resulting in a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 13.0
The remainder is 0 after subtracting 3 from 3.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

Moving on to step 3:
If we divide 1 by 1, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 131.0
The remainder is 0 after subtracting 1 from 1.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 1

Going ahead to step 4:
If we divide 2 by 1, we get 2 and a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 1312.0
If we subtract 2 from 2, we get 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 1

Step 5:
When dividing 0 by 1, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 13120.0
Subtracting 0 from 0 leaves us with 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 1

Advancing to step 6:
When dividing 5 by 1, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 131205.0
Subtracting 5 from 5 leaves us 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:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 131205.0
Subtracting 0 from 0 leaves us 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.

Let's proceed to step 8:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 131205.0
Subtract 0 from 0 to get 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 131205.0 with a remainder of 0.0.