We're dividing 358536 by 91 
The aim is to understand the frequency of 91 in 358536.

Let's proceed to step 1:
If we divide 3 by 91, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 91

Advancing to step 2:
When dividing 35 by 91, we get 0 with a remainder of 35.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 35 after subtracting 0 from 35.
Bring next digit (8) of the dividend behind the 35 and repeat the process: 358 / 91

Step 3:
When dividing 358 by 91, we get 3 with a remainder of 85.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 273 away from 358, we end up with 85.
Take the next digit (5) from the dividend and append it to 85, then repeat: 855 / 91

Moving on to step 4:
The number 91 fits into 855 9 times, leaving a remainder of 36.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
Subtracting 819 from 855 leaves us with 36.
Take the next digit (3) from the dividend and append it to 36, then repeat: 363 / 91

Advancing to step 5:
When dividing 363 by 91, we get 3 with a remainder of 90.
Record the quotient 3 as the next digit in the result. 
Result so far: 393.0
The remainder is 90 after subtracting 273 from 363.
Grab the next digit (6) from the dividend, add it to 90, then carry on: 906 / 91

Step 6:
The number 91 fits into 906 9 times, leaving a remainder of 87.
The number 9 becomes the next digit in our result. 
Result so far: 3939.0
If we take 819 away from 906, we end up with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Let's proceed to step 7:
91 goes into 870 9 times with a remainder of 51.
Record the quotient 9 as the next digit in the result. 
Result so far: 3939.9
The remainder is 51 after subtracting 819 from 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Step 8:
91 can be fit into 510 5 times, resulting in a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 3939.95
The remainder is 55 after subtracting 455 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 9:
If we divide 550 by 91, we get 6 and a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 3939.956
Subtract 546 from 550 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 10:
40 divided by 91 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 3939.956
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 11:
400 divided by 91 is 4 with a remainder of 36.
The next digit of our result is 4. 
Result so far: 3939.95604
If we subtract 364 from 400, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 12:
The number 91 fits into 360 3 times, leaving a remainder of 87.
Write down 3 as next digit of the result. 
Result so far: 3939.956043
If we take 273 away from 360, we end up with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 13:
If we divide 870 by 91, we get 9 and a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 3939.9560439
Deduct 819 from 870 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Step 14:
The number 91 fits into 510 5 times, leaving a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 3939.95604395
Subtracting 455 from 510 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.

Our division results in 3939.95604395 with a remaining 5.5e-08.