We're dividing 91139251 by 855 
The aim is to understand the frequency of 855 in 91139251.

Step 1:
If we divide 9 by 855, we get 0 and a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 855

Let's proceed to step 2:
91 divided by 855 is 0 with a remainder of 91.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 91, we end up with 91.
Include the next digit (1) from the dividend after 91, then repeat: 911 / 855

Advancing to step 3:
When dividing 911 by 855, we get 1 with a remainder of 56.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 56 after subtracting 855 from 911.
Fetch the next digit (3) from the dividend, attach it to 56 and continue: 563 / 855

Let's proceed to step 4:
When dividing 563 by 855, we get 0 with a remainder of 563.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 563 and we're left with 563.
Fetch the next digit (9) from the dividend, attach it to 563 and continue: 5639 / 855

Going ahead to step 5:
The number 855 fits into 5639 6 times, leaving a remainder of 509.
Write down 6 as next digit of the result. 
Result so far: 106.0
Subtract 5130 from 5639 to get 509.
Take the next digit (2) from the dividend and append it to 509, then repeat: 5092 / 855

Let's proceed to step 6:
855 can be fit into 5092 5 times, resulting in a remainder of 817.
The number 5 becomes the next digit in our result. 
Result so far: 1065.0
If we subtract 4275 from 5092, we get 817.
Grab the next digit (5) from the dividend, add it to 817, then carry on: 8175 / 855

Advancing to step 7:
855 goes into 8175 9 times with a remainder of 480.
The next digit of our result is 9. 
Result so far: 10659.0
Deduct 7695 from 8175 and we're left with 480.
Include the next digit (1) from the dividend after 480, then repeat: 4801 / 855

On to step 8:
855 can be fit into 4801 5 times, resulting in a remainder of 526.
The number 5 becomes the next digit in our result. 
Result so far: 106595.0
Subtract 4275 from 4801 to get 526.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5260, and continue the process.

Let's proceed to step 9:
If we divide 5260 by 855, we get 6 and a remainder of 130.
Record the quotient 6 as the next digit in the result. 
Result so far: 106595.6
The remainder is 130 after subtracting 5130 from 5260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Step 10:
The number 855 fits into 1300 1 times, leaving a remainder of 445.
Put 1 as the next digit of the answer. 
Result so far: 106595.61
If we take 855 away from 1300, we end up with 445.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

Let's proceed to step 11:
855 can be fit into 4450 5 times, resulting in a remainder of 175.
The next digit of our result is 5. 
Result so far: 106595.615
If we subtract 4275 from 4450, we get 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Let's proceed to step 12:
The number 855 fits into 1750 2 times, leaving a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 106595.6152
The remainder is 40 after subtracting 1710 from 1750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 13:
855 goes into 400 0 times with a remainder of 400.
The number 0 becomes the next digit in our result. 
Result so far: 106595.6152
If we subtract 0 from 400, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 14:
When dividing 4000 by 855, we get 4 with a remainder of 580.
The number 4 becomes the next digit in our result. 
Result so far: 106595.615204
Subtracting 3420 from 4000 leaves us with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

On to step 15:
When dividing 5800 by 855, we get 6 with a remainder of 670.
Write down 6 as next digit of the result. 
Result so far: 106595.6152046
Subtract 5130 from 5800 to get 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

Moving on to step 16:
When dividing 6700 by 855, we get 7 with a remainder of 715.
The next digit of our result is 7. 
Result so far: 106595.61520467
If we subtract 5985 from 6700, we get 715.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7150, and continue the process.

The quotient of the division is 106595.61520467, and the remainder is 7.15e-07.