We divide 27807823 by 91
The aim is to understand the frequency of 91 in 27807823.

On to step 1:
91 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 91

On to step 2:
When dividing 27 by 91, we get 0 with a remainder of 27.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 27, we get 27.
Take the next digit (8) from the dividend and append it to 27, then repeat: 278 / 91

Step 3:
The number 91 fits into 278 3 times, leaving a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 5 after subtracting 273 from 278.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 91

Moving on to step 4:
91 goes into 50 0 times with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
If we subtract 0 from 50, we get 50.
Fetch the next digit (7) from the dividend, attach it to 50 and continue: 507 / 91

Moving on to step 5:
91 goes into 507 5 times with a remainder of 52.
Use 5 as the next digit of our solution. 
Result so far: 305.0
If we subtract 455 from 507, we get 52.
Include the next digit (8) from the dividend after 52, then repeat: 528 / 91

Step 6:
91 can be fit into 528 5 times, resulting in a remainder of 73.
The number 5 becomes the next digit in our result. 
Result so far: 3055.0
Subtracting 455 from 528 leaves us with 73.
Fetch the next digit (2) from the dividend, attach it to 73 and continue: 732 / 91

Step 7:
The number 91 fits into 732 8 times, leaving a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 30558.0
If we subtract 728 from 732, we get 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 91

Advancing to step 8:
91 goes into 43 0 times with a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 305580.0
The remainder is 43 after subtracting 0 from 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 9:
If we divide 430 by 91, we get 4 and a remainder of 66.
The next digit of our result is 4. 
Result so far: 305580.4
Subtract 364 from 430 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 10:
If we divide 660 by 91, we get 7 and a remainder of 23.
The next digit of our result is 7. 
Result so far: 305580.47
Subtract 637 from 660 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 11:
91 can be fit into 230 2 times, resulting in a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 305580.472
If we subtract 182 from 230, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 12:
480 divided by 91 is 5 with a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 305580.4725
The remainder is 25 after subtracting 455 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 13:
If we divide 250 by 91, we get 2 and a remainder of 68.
Record the quotient 2 as the next digit in the result. 
Result so far: 305580.47252
Subtracting 182 from 250 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 14:
If we divide 680 by 91, we get 7 and a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 305580.472527
Deduct 637 from 680 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 15:
When dividing 430 by 91, we get 4 with a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 305580.4725274
Subtracting 364 from 430 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 16:
660 divided by 91 is 7 with a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 305580.47252747
The remainder is 23 after subtracting 637 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

The final outcome is 305580.47252747, with a leftover of 2.3e-08.