We're dividing 435687 by 91 
The aim is to understand the frequency of 91 in 435687.

Advancing to step 1:
4 divided by 91 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 91

Let's proceed to step 2:
91 goes into 43 0 times with a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Grab the next digit (5) from the dividend, add it to 43, then carry on: 435 / 91

On to step 3:
The number 91 fits into 435 4 times, leaving a remainder of 71.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 364 from 435 to get 71.
Take the next digit (6) from the dividend and append it to 71, then repeat: 716 / 91

Let's proceed to step 4:
91 goes into 716 7 times with a remainder of 79.
The next digit of our result is 7. 
Result so far: 47.0
The remainder is 79 after subtracting 637 from 716.
Include the next digit (8) from the dividend after 79, then repeat: 798 / 91

Advancing to step 5:
91 goes into 798 8 times with a remainder of 70.
Write down 8 as next digit of the result. 
Result so far: 478.0
Deduct 728 from 798 and we're left with 70.
Include the next digit (7) from the dividend after 70, then repeat: 707 / 91

Step 6:
The number 91 fits into 707 7 times, leaving a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 4787.0
The remainder is 70 after subtracting 637 from 707.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 7:
When dividing 700 by 91, we get 7 with a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 4787.7
If we subtract 637 from 700, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Let's proceed to step 8:
The number 91 fits into 630 6 times, leaving a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 4787.76
Deduct 546 from 630 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 9:
840 divided by 91 is 9 with a remainder of 21.
The next digit of our result is 9. 
Result so far: 4787.769
Subtract 819 from 840 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 10:
210 divided by 91 is 2 with a remainder of 28.
Put 2 as the next digit of the answer. 
Result so far: 4787.7692
If we take 182 away from 210, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 11:
91 goes into 280 3 times with a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 4787.76923
Subtracting 273 from 280 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 12:
When dividing 70 by 91, we get 0 with a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 4787.76923
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 13:
700 divided by 91 is 7 with a remainder of 63.
Write down 7 as next digit of the result. 
Result so far: 4787.7692307
Subtracting 637 from 700 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 14:
When dividing 630 by 91, we get 6 with a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 4787.76923076
Subtract 546 from 630 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

After the division, we end up with 4787.76923076 and a remainder of 8.4e-08.