86953338 divided by 661 
The aim is to understand the frequency of 661 in 86953338.

Let's proceed to step 1:
8 divided by 661 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 661

Let's proceed to step 2:
The number 661 fits into 86 0 times, leaving a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Fetch the next digit (9) from the dividend, attach it to 86 and continue: 869 / 661

Let's proceed to step 3:
661 can be fit into 869 1 times, resulting in a remainder of 208.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 661 from 869 to get 208.
Take the next digit (5) from the dividend and append it to 208, then repeat: 2085 / 661

Advancing to step 4:
661 goes into 2085 3 times with a remainder of 102.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
If we subtract 1983 from 2085, we get 102.
Include the next digit (3) from the dividend after 102, then repeat: 1023 / 661

Moving on to step 5:
The number 661 fits into 1023 1 times, leaving a remainder of 362.
The next digit of our result is 1. 
Result so far: 131.0
If we subtract 661 from 1023, we get 362.
Fetch the next digit (3) from the dividend, attach it to 362 and continue: 3623 / 661

Advancing to step 6:
The number 661 fits into 3623 5 times, leaving a remainder of 318.
Record the quotient 5 as the next digit in the result. 
Result so far: 1315.0
Subtract 3305 from 3623 to get 318.
Grab the next digit (3) from the dividend, add it to 318, then carry on: 3183 / 661

Step 7:
The number 661 fits into 3183 4 times, leaving a remainder of 539.
Write down 4 as next digit of the result. 
Result so far: 13154.0
If we take 2644 away from 3183, we end up with 539.
Include the next digit (8) from the dividend after 539, then repeat: 5398 / 661

Going ahead to step 8:
5398 divided by 661 is 8 with a remainder of 110.
Record the quotient 8 as the next digit in the result. 
Result so far: 131548.0
Subtract 5288 from 5398 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 9:
If we divide 1100 by 661, we get 1 and a remainder of 439.
Write down 1 as next digit of the result. 
Result so far: 131548.1
Deduct 661 from 1100 and we're left with 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

Going ahead to step 10:
661 can be fit into 4390 6 times, resulting in a remainder of 424.
Put 6 as the next digit of the answer. 
Result so far: 131548.16
Subtracting 3966 from 4390 leaves us with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Advancing to step 11:
4240 divided by 661 is 6 with a remainder of 274.
Put 6 as the next digit of the answer. 
Result so far: 131548.166
If we take 3966 away from 4240, we end up with 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

The final result is 131548.166 with a remainder of 0.0274.