We divide 8515855 by 855
The aim is to understand the frequency of 855 in 8515855.

On to step 1:
When dividing 8 by 855, we get 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 (5) from the dividend, attach it to 8 and continue: 85 / 855

Advancing to step 2:
When dividing 85 by 855, we get 0 with a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 85 and we're left with 85.
Append the next digit (1) from the dividend to 85 and continue with: 851 / 855

Step 3:
851 divided by 855 is 0 with a remainder of 851.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 851, we get 851.
Grab the next digit (5) from the dividend, add it to 851, then carry on: 8515 / 855

Moving on to step 4:
855 can be fit into 8515 9 times, resulting in a remainder of 820.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Subtracting 7695 from 8515 leaves us with 820.
Bring next digit (8) of the dividend behind the 820 and repeat the process: 8208 / 855

Moving on to step 5:
855 can be fit into 8208 9 times, resulting in a remainder of 513.
Write down 9 as next digit of the result. 
Result so far: 99.0
The remainder is 513 after subtracting 7695 from 8208.
Grab the next digit (5) from the dividend, add it to 513, then carry on: 5135 / 855

Let's proceed to step 6:
If we divide 5135 by 855, we get 6 and a remainder of 5.
Use 6 as the next digit of our solution. 
Result so far: 996.0
Subtract 5130 from 5135 to get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 855

On to step 7:
The number 855 fits into 55 0 times, leaving a remainder of 55.
The number 0 becomes the next digit in our result. 
Result so far: 9960.0
Subtracting 0 from 55 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 8:
The number 855 fits into 550 0 times, leaving a remainder of 550.
Record the quotient 0 as the next digit in the result. 
Result so far: 9960.0
If we subtract 0 from 550, we get 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Going ahead to step 9:
When dividing 5500 by 855, we get 6 with a remainder of 370.
The next digit of our result is 6. 
Result so far: 9960.06
If we take 5130 away from 5500, we end up with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

On to step 10:
3700 divided by 855 is 4 with a remainder of 280.
Record the quotient 4 as the next digit in the result. 
Result so far: 9960.064
If we subtract 3420 from 3700, we get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 11:
When dividing 2800 by 855, we get 3 with a remainder of 235.
Put 3 as the next digit of the answer. 
Result so far: 9960.0643
Subtracting 2565 from 2800 leaves us with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Step 12:
If we divide 2350 by 855, we get 2 and a remainder of 640.
The next digit of our result is 2. 
Result so far: 9960.06432
Deduct 1710 from 2350 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Moving on to step 13:
If we divide 6400 by 855, we get 7 and a remainder of 415.
Record the quotient 7 as the next digit in the result. 
Result so far: 9960.064327
Subtract 5985 from 6400 to get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

On to step 14:
855 can be fit into 4150 4 times, resulting in a remainder of 730.
The number 4 becomes the next digit in our result. 
Result so far: 9960.0643274
If we subtract 3420 from 4150, we get 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7300, and continue the process.

Step 15:
7300 divided by 855 is 8 with a remainder of 460.
The number 8 becomes the next digit in our result. 
Result so far: 9960.06432748
Deduct 6840 from 7300 and we're left with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

After the division, we end up with 9960.06432748 and a remainder of 4.6e-07.