We're dividing 536401 by 91 
The aim is to understand the frequency of 91 in 536401.

Step 1:
91 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 91

Let's proceed to step 2:
When dividing 53 by 91, we get 0 with a remainder of 53.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 53 to get 53.
Fetch the next digit (6) from the dividend, attach it to 53 and continue: 536 / 91

Advancing to step 3:
536 divided by 91 is 5 with a remainder of 81.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 455 from 536, we get 81.
Take the next digit (4) from the dividend and append it to 81, then repeat: 814 / 91

On to step 4:
When dividing 814 by 91, we get 8 with a remainder of 86.
Write down 8 as next digit of the result. 
Result so far: 58.0
If we take 728 away from 814, we end up with 86.
Include the next digit (0) from the dividend after 86, then repeat: 860 / 91

Let's proceed to step 5:
860 divided by 91 is 9 with a remainder of 41.
The next digit of our result is 9. 
Result so far: 589.0
If we take 819 away from 860, we end up with 41.
Grab the next digit (1) from the dividend, add it to 41, then carry on: 411 / 91

Advancing to step 6:
If we divide 411 by 91, we get 4 and a remainder of 47.
Record the quotient 4 as the next digit in the result. 
Result so far: 5894.0
The remainder is 47 after subtracting 364 from 411.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead 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: 5894.5
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.

Advancing to step 8:
150 divided by 91 is 1 with a remainder of 59.
Write down 1 as next digit of the result. 
Result so far: 5894.51
Subtracting 91 from 150 leaves us 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.

Step 9:
590 divided by 91 is 6 with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 5894.516
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.

Let's proceed to step 10:
91 can be fit into 440 4 times, resulting in a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 5894.5164
If we subtract 364 from 440, we 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.

Advancing to step 11:
When dividing 760 by 91, we get 8 with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 5894.51648
Subtract 728 from 760 to 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 12:
320 divided by 91 is 3 with a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 5894.516483
If we take 273 away from 320, we end up 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 13:
If we divide 470 by 91, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 5894.5164835
The remainder is 15 after subtracting 455 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 14:
The number 91 fits into 150 1 times, leaving a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 5894.51648351
Subtracting 91 from 150 leaves us 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 5894.51648351 with a remainder of 5.9e-08.