We look at the division of 218004 by 91 
The aim is to understand the frequency of 91 in 218004.

Moving on to step 1:
The number 91 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 91

Going ahead to step 2:
If we divide 21 by 91, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (8) from the dividend to 21 and continue with: 218 / 91

Advancing to step 3:
The number 91 fits into 218 2 times, leaving a remainder of 36.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 36 after subtracting 182 from 218.
Append the next digit (0) from the dividend to 36 and continue with: 360 / 91

Advancing to step 4:
The number 91 fits into 360 3 times, leaving a remainder of 87.
The next digit of our result is 3. 
Result so far: 23.0
Deduct 273 from 360 and we're left with 87.
Take the next digit (0) from the dividend and append it to 87, then repeat: 870 / 91

Advancing to step 5:
If we divide 870 by 91, we get 9 and a remainder of 51.
The number 9 becomes the next digit in our result. 
Result so far: 239.0
If we subtract 819 from 870, we get 51.
Fetch the next digit (4) from the dividend, attach it to 51 and continue: 514 / 91

Going ahead to step 6:
If we divide 514 by 91, we get 5 and a remainder of 59.
The next digit of our result is 5. 
Result so far: 2395.0
If we take 455 away from 514, we end up with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Advancing to step 7:
91 can be fit into 590 6 times, resulting in a remainder of 44.
The next digit of our result is 6. 
Result so far: 2395.6
If we take 546 away from 590, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 8:
440 divided by 91 is 4 with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 2395.64
The remainder is 76 after subtracting 364 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 9:
When dividing 760 by 91, we get 8 with a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 2395.648
If we subtract 728 from 760, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 10:
320 divided by 91 is 3 with a remainder of 47.
The next digit of our result is 3. 
Result so far: 2395.6483
The remainder is 47 after subtracting 273 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 11:
470 divided by 91 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 2395.64835
Subtracting 455 from 470 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 12:
If we divide 150 by 91, we get 1 and a remainder of 59.
Record the quotient 1 as the next digit in the result. 
Result so far: 2395.648351
Subtract 91 from 150 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 13:
If we divide 590 by 91, we get 6 and a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 2395.6483516
If we subtract 546 from 590, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 14:
If we divide 440 by 91, we get 4 and a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 2395.64835164
Subtract 364 from 440 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final result is 2395.64835164 with a remainder of 7.6e-08.