We look at the division of 85815187 by 869 
The aim is to understand the frequency of 869 in 85815187.

Going ahead to step 1:
When dividing 8 by 869, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 869

Advancing to step 2:
The number 869 fits into 85 0 times, leaving a remainder of 85.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 85 and we're left with 85.
Fetch the next digit (8) from the dividend, attach it to 85 and continue: 858 / 869

Step 3:
If we divide 858 by 869, we get 0 and a remainder of 858.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 858, we end up with 858.
Take the next digit (1) from the dividend and append it to 858, then repeat: 8581 / 869

Going ahead to step 4:
When dividing 8581 by 869, we get 9 with a remainder of 760.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 7821 from 8581 and we're left with 760.
Grab the next digit (5) from the dividend, add it to 760, then carry on: 7605 / 869

Advancing to step 5:
869 goes into 7605 8 times with a remainder of 653.
Put 8 as the next digit of the answer. 
Result so far: 98.0
If we take 6952 away from 7605, we end up with 653.
Grab the next digit (1) from the dividend, add it to 653, then carry on: 6531 / 869

Let's proceed to step 6:
869 can be fit into 6531 7 times, resulting in a remainder of 448.
Write down 7 as next digit of the result. 
Result so far: 987.0
Subtracting 6083 from 6531 leaves us with 448.
Fetch the next digit (8) from the dividend, attach it to 448 and continue: 4488 / 869

Step 7:
If we divide 4488 by 869, we get 5 and a remainder of 143.
Use 5 as the next digit of our solution. 
Result so far: 9875.0
Subtract 4345 from 4488 to get 143.
Fetch the next digit (7) from the dividend, attach it to 143 and continue: 1437 / 869

Let's proceed to step 8:
869 goes into 1437 1 times with a remainder of 568.
Write down 1 as next digit of the result. 
Result so far: 98751.0
The remainder is 568 after subtracting 869 from 1437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Going ahead to step 9:
869 goes into 5680 6 times with a remainder of 466.
Put 6 as the next digit of the answer. 
Result so far: 98751.6
If we take 5214 away from 5680, we end up with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Moving on to step 10:
869 goes into 4660 5 times with a remainder of 315.
Use 5 as the next digit of our solution. 
Result so far: 98751.65
Subtracting 4345 from 4660 leaves us with 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Going ahead to step 11:
If we divide 3150 by 869, we get 3 and a remainder of 543.
Write down 3 as next digit of the result. 
Result so far: 98751.653
If we subtract 2607 from 3150, we get 543.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5430, and continue the process.

Going ahead to step 12:
5430 divided by 869 is 6 with a remainder of 216.
Write down 6 as next digit of the result. 
Result so far: 98751.6536
The remainder is 216 after subtracting 5214 from 5430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Advancing to step 13:
The number 869 fits into 2160 2 times, leaving a remainder of 422.
Write down 2 as next digit of the result. 
Result so far: 98751.65362
Subtracting 1738 from 2160 leaves us with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Step 14:
The number 869 fits into 4220 4 times, leaving a remainder of 744.
The number 4 becomes the next digit in our result. 
Result so far: 98751.653624
If we take 3476 away from 4220, we end up with 744.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Going ahead to step 15:
If we divide 7440 by 869, we get 8 and a remainder of 488.
Put 8 as the next digit of the answer. 
Result so far: 98751.6536248
If we take 6952 away from 7440, we end up with 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

On to step 16:
The number 869 fits into 4880 5 times, leaving a remainder of 535.
Write down 5 as next digit of the result. 
Result so far: 98751.65362485
Subtracting 4345 from 4880 leaves us with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

The final result is 98751.65362485 with a remainder of 5.35e-07.