We look at the division of 866951 by 1 
The aim is to understand the frequency of 1 in 866951.

On to step 1:
8 divided by 1 is 8 with a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 8 from 8, we get 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 1

Going ahead to step 2:
1 goes into 6 6 times with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 86.0
Subtract 6 from 6 to get 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 1

Moving on to step 3:
When dividing 6 by 1, we get 6 with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 866.0
Subtract 6 from 6 to get 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 1

Moving on to step 4:
The number 1 fits into 9 9 times, leaving a remainder of 0.
The next digit of our result is 9. 
Result so far: 8669.0
Subtract 9 from 9 to get 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 1

Moving on to step 5:
5 divided by 1 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 86695.0
Deduct 5 from 5 and we're left with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

Step 6:
1 goes into 1 1 times with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 866951.0
Deduct 1 from 1 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.

Let's proceed to step 7:
The number 1 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 866951.0
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.

On to step 8:
If we divide 0 by 1, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 866951.0
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.

Our division results in 866951.0 with a remaining 0.0.