We look at the division of 66086103 by 861 
The aim is to understand the frequency of 861 in 66086103.

Let's proceed to step 1:
861 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 861

Advancing to step 2:
The number 861 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Grab the next digit (0) from the dividend, add it to 66, then carry on: 660 / 861

Step 3:
When dividing 660 by 861, we get 0 with a remainder of 660.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 660, we get 660.
Grab the next digit (8) from the dividend, add it to 660, then carry on: 6608 / 861

Going ahead to step 4:
6608 divided by 861 is 7 with a remainder of 581.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we take 6027 away from 6608, we end up with 581.
Include the next digit (6) from the dividend after 581, then repeat: 5816 / 861

Let's proceed to step 5:
When dividing 5816 by 861, we get 6 with a remainder of 650.
Put 6 as the next digit of the answer. 
Result so far: 76.0
If we subtract 5166 from 5816, we get 650.
Include the next digit (1) from the dividend after 650, then repeat: 6501 / 861

Going ahead to step 6:
861 goes into 6501 7 times with a remainder of 474.
The next digit of our result is 7. 
Result so far: 767.0
Subtract 6027 from 6501 to get 474.
Append the next digit (0) from the dividend to 474 and continue with: 4740 / 861

Moving on to step 7:
When dividing 4740 by 861, we get 5 with a remainder of 435.
Write down 5 as next digit of the result. 
Result so far: 7675.0
If we subtract 4305 from 4740, we get 435.
Grab the next digit (3) from the dividend, add it to 435, then carry on: 4353 / 861

On to step 8:
If we divide 4353 by 861, we get 5 and a remainder of 48.
Use 5 as the next digit of our solution. 
Result so far: 76755.0
Deduct 4305 from 4353 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 9:
861 can be fit into 480 0 times, resulting in a remainder of 480.
Use 0 as the next digit of our solution. 
Result so far: 76755.0
If we take 0 away from 480, we end up with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 10:
The number 861 fits into 4800 5 times, leaving a remainder of 495.
Write down 5 as next digit of the result. 
Result so far: 76755.05
Subtracting 4305 from 4800 leaves us with 495.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4950, and continue the process.

Let's proceed to step 11:
861 can be fit into 4950 5 times, resulting in a remainder of 645.
Record the quotient 5 as the next digit in the result. 
Result so far: 76755.055
If we subtract 4305 from 4950, we get 645.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

After the division, we end up with 76755.055 and a remainder of 0.0645.