We're dividing 217355 by 91 
The aim is to understand the frequency of 91 in 217355.

Advancing to step 1:
91 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 91

Advancing to step 2:
If we divide 21 by 91, we get 0 and a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Take the next digit (7) from the dividend and append it to 21, then repeat: 217 / 91

Advancing to step 3:
91 can be fit into 217 2 times, resulting in a remainder of 35.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 182 away from 217, we end up with 35.
Bring next digit (3) of the dividend behind the 35 and repeat the process: 353 / 91

On to step 4:
If we divide 353 by 91, we get 3 and a remainder of 80.
The next digit of our result is 3. 
Result so far: 23.0
The remainder is 80 after subtracting 273 from 353.
Append the next digit (5) from the dividend to 80 and continue with: 805 / 91

Let's proceed to step 5:
The number 91 fits into 805 8 times, leaving a remainder of 77.
Record the quotient 8 as the next digit in the result. 
Result so far: 238.0
If we take 728 away from 805, we end up with 77.
Grab the next digit (5) from the dividend, add it to 77, then carry on: 775 / 91

Step 6:
91 can be fit into 775 8 times, resulting in a remainder of 47.
The number 8 becomes the next digit in our result. 
Result so far: 2388.0
Subtracting 728 from 775 leaves us with 47.
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 7:
The number 91 fits into 470 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 2388.5
If we take 455 away from 470, we end up 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 8:
If we divide 150 by 91, we get 1 and a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 2388.51
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.

Advancing to step 9:
When dividing 590 by 91, we get 6 with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 2388.516
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 10:
440 divided by 91 is 4 with a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 2388.5164
If we take 364 away from 440, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 11:
The number 91 fits into 760 8 times, leaving a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 2388.51648
If we take 728 away from 760, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 12:
91 can be fit into 320 3 times, resulting in a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 2388.516483
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.

On to step 13:
470 divided by 91 is 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 2388.5164835
Subtract 455 from 470 to get 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 14:
The number 91 fits into 150 1 times, leaving a remainder of 59.
The next digit of our result is 1. 
Result so far: 2388.51648351
Deduct 91 from 150 and we're left 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.

The final result is 2388.51648351 with a remainder of 5.9e-08.