We look at the division of 125257 by 1 
The aim is to understand the frequency of 1 in 125257.

On to step 1:
When dividing 1 by 1, we get 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 1 away from 1, we end up with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 1

Going ahead to step 2:
The number 1 fits into 2 2 times, leaving a remainder of 0.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 2 from 2, we get 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 1

Going ahead to step 3:
The number 1 fits into 5 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 125.0
Deduct 5 from 5 and we're left with 0.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 1

Going ahead to step 4:
1 can be fit into 2 2 times, resulting in a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 1252.0
The remainder is 0 after subtracting 2 from 2.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 1

Step 5:
The number 1 fits into 5 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 12525.0
Deduct 5 from 5 and we're left with 0.
Grab the next digit (7) from the dividend, add it to 0, then carry on: 7 / 1

Step 6:
If we divide 7 by 1, we get 7 and a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 125257.0
The remainder is 0 after subtracting 7 from 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
0 divided by 1 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 125257.0
The remainder is 0 after subtracting 0 from 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 8:
1 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 125257.0
If we subtract 0 from 0, we 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.

In conclusion, the division gives 125257.0 with a balance of 0.0.