We're dividing 661936 by 86 
The aim is to understand the frequency of 86 in 661936.

Let's proceed to step 1:
86 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 86

Let's proceed to step 2:
86 can be fit into 66 0 times, resulting in a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Take the next digit (1) from the dividend and append it to 66, then repeat: 661 / 86

Advancing to step 3:
86 goes into 661 7 times with a remainder of 59.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 602 from 661, we get 59.
Take the next digit (9) from the dividend and append it to 59, then repeat: 599 / 86

Going ahead to step 4:
86 goes into 599 6 times with a remainder of 83.
The number 6 becomes the next digit in our result. 
Result so far: 76.0
Deduct 516 from 599 and we're left with 83.
Take the next digit (3) from the dividend and append it to 83, then repeat: 833 / 86

Moving on to step 5:
86 can be fit into 833 9 times, resulting in a remainder of 59.
Put 9 as the next digit of the answer. 
Result so far: 769.0
If we take 774 away from 833, we end up with 59.
Grab the next digit (6) from the dividend, add it to 59, then carry on: 596 / 86

Step 6:
The number 86 fits into 596 6 times, leaving a remainder of 80.
Record the quotient 6 as the next digit in the result. 
Result so far: 7696.0
If we subtract 516 from 596, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 7:
86 can be fit into 800 9 times, resulting in a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 7696.9
If we take 774 away from 800, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 8:
When dividing 260 by 86, we get 3 with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 7696.93
Deduct 258 from 260 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 9:
86 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 7696.93
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 10:
When dividing 200 by 86, we get 2 with a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 7696.9302
Subtracting 172 from 200 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 11:
86 goes into 280 3 times with a remainder of 22.
Write down 3 as next digit of the result. 
Result so far: 7696.93023
If we subtract 258 from 280, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 12:
86 can be fit into 220 2 times, resulting in a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 7696.930232
The remainder is 48 after subtracting 172 from 220.
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 13:
86 can be fit into 480 5 times, resulting in a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 7696.9302325
The remainder is 50 after subtracting 430 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 14:
If we divide 500 by 86, we get 5 and a remainder of 70.
Use 5 as the next digit of our solution. 
Result so far: 7696.93023255
The remainder is 70 after subtracting 430 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 7696.93023255 with a remainder of 7e-08.