We're dividing 437864 by 91 
The aim is to understand the frequency of 91 in 437864.

Let's proceed to step 1:
4 divided by 91 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 91

On to step 2:
The number 91 fits into 43 0 times, leaving a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Fetch the next digit (7) from the dividend, attach it to 43 and continue: 437 / 91

Moving on to step 3:
91 can be fit into 437 4 times, resulting in a remainder of 73.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 73 after subtracting 364 from 437.
Grab the next digit (8) from the dividend, add it to 73, then carry on: 738 / 91

Moving on to step 4:
91 goes into 738 8 times with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
The remainder is 10 after subtracting 728 from 738.
Fetch the next digit (6) from the dividend, attach it to 10 and continue: 106 / 91

Going ahead to step 5:
106 divided by 91 is 1 with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 481.0
Subtract 91 from 106 to get 15.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 91

Going ahead to step 6:
91 goes into 154 1 times with a remainder of 63.
Write down 1 as next digit of the result. 
Result so far: 4811.0
Subtracting 91 from 154 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.

Step 7:
91 can be fit into 630 6 times, resulting in a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 4811.6
If we subtract 546 from 630, we 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.

On to step 8:
When dividing 840 by 91, we get 9 with a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 4811.69
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 9:
When dividing 210 by 91, we get 2 with a remainder of 28.
The next digit of our result is 2. 
Result so far: 4811.692
Subtract 182 from 210 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 10:
91 goes into 280 3 times with a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 4811.6923
If we subtract 273 from 280, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 11:
The number 91 fits into 70 0 times, leaving a remainder of 70.
The next digit of our result is 0. 
Result so far: 4811.6923
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.

Let's proceed to step 12:
91 can be fit into 700 7 times, resulting in a remainder of 63.
Use 7 as the next digit of our solution. 
Result so far: 4811.692307
If we take 637 away from 700, we end up 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.

Step 13:
630 divided by 91 is 6 with a remainder of 84.
The next digit of our result is 6. 
Result so far: 4811.6923076
The remainder is 84 after subtracting 546 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

On to step 14:
840 divided by 91 is 9 with a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 4811.69230769
Subtracting 819 from 840 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

The quotient of the division is 4811.69230769, and the remainder is 2.1e-08.