511838 divided by 91 
The aim is to understand the frequency of 91 in 511838.

Going ahead to step 1:
91 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 91

Advancing to step 2:
If we divide 51 by 91, we get 0 and a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Append the next digit (1) from the dividend to 51 and continue with: 511 / 91

Step 3:
When dividing 511 by 91, we get 5 with a remainder of 56.
The next digit of our result is 5. 
Result so far: 5.0
If we subtract 455 from 511, we get 56.
Bring next digit (8) of the dividend behind the 56 and repeat the process: 568 / 91

On to step 4:
91 goes into 568 6 times with a remainder of 22.
The next digit of our result is 6. 
Result so far: 56.0
Subtracting 546 from 568 leaves us with 22.
Bring next digit (3) of the dividend behind the 22 and repeat the process: 223 / 91

Let's proceed to step 5:
91 can be fit into 223 2 times, resulting in a remainder of 41.
The next digit of our result is 2. 
Result so far: 562.0
If we take 182 away from 223, we end up with 41.
Fetch the next digit (8) from the dividend, attach it to 41 and continue: 418 / 91

Moving on to step 6:
The number 91 fits into 418 4 times, leaving a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 5624.0
Subtracting 364 from 418 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 7:
91 can be fit into 540 5 times, resulting in a remainder of 85.
Write down 5 as next digit of the result. 
Result so far: 5624.5
If we take 455 away from 540, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Going ahead to step 8:
The number 91 fits into 850 9 times, leaving a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 5624.59
If we subtract 819 from 850, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 9:
When dividing 310 by 91, we get 3 with a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 5624.593
If we subtract 273 from 310, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 10:
370 divided by 91 is 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 5624.5934
If we subtract 364 from 370, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
The number 91 fits into 60 0 times, leaving a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 5624.5934
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 12:
If we divide 600 by 91, we get 6 and a remainder of 54.
Record the quotient 6 as the next digit in the result. 
Result so far: 5624.593406
Subtracting 546 from 600 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Let's proceed to step 13:
The number 91 fits into 540 5 times, leaving a remainder of 85.
The number 5 becomes the next digit in our result. 
Result so far: 5624.5934065
If we take 455 away from 540, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Going ahead to step 14:
If we divide 850 by 91, we get 9 and a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 5624.59340659
If we take 819 away from 850, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

After the division, we end up with 5624.59340659 and a remainder of 3.1e-08.