We look at the division of 561672 by 1 
The aim is to understand the frequency of 1 in 561672.

Let's proceed to step 1:
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: 5.0
If we subtract 5 from 5, we get 0.
Include the next digit (6) from the dividend after 0, then repeat: 6 / 1

Going ahead to step 2:
1 goes into 6 6 times with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 56.0
The remainder is 0 after subtracting 6 from 6.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 1

Moving on to step 3:
1 divided by 1 is 1 with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 561.0
Deduct 1 from 1 and we're left with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 1

Advancing to step 4:
1 goes into 6 6 times with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 5616.0
If we take 6 away from 6, we end up with 0.
Include the next digit (7) from the dividend after 0, then repeat: 7 / 1

Step 5:
The number 1 fits into 7 7 times, leaving a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 56167.0
Subtract 7 from 7 to get 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 1

Moving on to step 6:
If we divide 2 by 1, we get 2 and a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 561672.0
Deduct 2 from 2 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.

Step 7:
When dividing 0 by 1, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 561672.0
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.

Advancing to step 8:
If we divide 0 by 1, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 561672.0
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.

Our division results in 561672.0 with a remaining 0.0.