We're dividing 864564 by 91 
The aim is to understand the frequency of 91 in 864564.

Step 1:
91 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 91

On to step 2:
The number 91 fits into 86 0 times, leaving a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Fetch the next digit (4) from the dividend, attach it to 86 and continue: 864 / 91

Moving on to step 3:
864 divided by 91 is 9 with a remainder of 45.
Put 9 as the next digit of the answer. 
Result so far: 9.0
The remainder is 45 after subtracting 819 from 864.
Include the next digit (5) from the dividend after 45, then repeat: 455 / 91

Step 4:
91 goes into 455 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 95.0
If we take 455 away from 455, we end up with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 91

Advancing to step 5:
6 divided by 91 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 950.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 91

Let's proceed to step 6:
The number 91 fits into 64 0 times, leaving a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 9500.0
If we take 0 away from 64, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 7:
The number 91 fits into 640 7 times, leaving a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 9500.7
Subtract 637 from 640 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 8:
91 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 9500.7
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
When dividing 300 by 91, we get 3 with a remainder of 27.
The next digit of our result is 3. 
Result so far: 9500.703
The remainder is 27 after subtracting 273 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 10:
When dividing 270 by 91, we get 2 with a remainder of 88.
The next digit of our result is 2. 
Result so far: 9500.7032
If we take 182 away from 270, we end up with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 11:
When dividing 880 by 91, we get 9 with a remainder of 61.
Write down 9 as next digit of the result. 
Result so far: 9500.70329
If we take 819 away from 880, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 12:
91 can be fit into 610 6 times, resulting in a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 9500.703296
If we take 546 away from 610, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 13:
91 goes into 640 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 9500.7032967
Subtracting 637 from 640 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 14:
91 goes into 30 0 times with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 9500.7032967
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 9500.7032967 with a remainder of 3e-08.