438065 divided by 91 
The aim is to understand the frequency of 91 in 438065.

Let's proceed to step 1:
If we divide 4 by 91, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 91

Going ahead to step 2:
The number 91 fits into 43 0 times, leaving a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Take the next digit (8) from the dividend and append it to 43, then repeat: 438 / 91

Step 3:
When dividing 438 by 91, we get 4 with a remainder of 74.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 364 from 438 to get 74.
Append the next digit (0) from the dividend to 74 and continue with: 740 / 91

Going ahead to step 4:
When dividing 740 by 91, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 48.0
Subtracting 728 from 740 leaves us with 12.
Fetch the next digit (6) from the dividend, attach it to 12 and continue: 126 / 91

Step 5:
When dividing 126 by 91, we get 1 with a remainder of 35.
The number 1 becomes the next digit in our result. 
Result so far: 481.0
If we subtract 91 from 126, we get 35.
Append the next digit (5) from the dividend to 35 and continue with: 355 / 91

On to step 6:
If we divide 355 by 91, we get 3 and a remainder of 82.
The next digit of our result is 3. 
Result so far: 4813.0
The remainder is 82 after subtracting 273 from 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 7:
The number 91 fits into 820 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 4813.9
If we subtract 819 from 820, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 8:
10 divided by 91 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 4813.9
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
91 can be fit into 100 1 times, resulting in a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 4813.901
Subtract 91 from 100 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 10:
If we divide 90 by 91, we get 0 and a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 4813.901
If we subtract 0 from 90, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 11:
91 can be fit into 900 9 times, resulting in a remainder of 81.
The number 9 becomes the next digit in our result. 
Result so far: 4813.90109
Deduct 819 from 900 and we're left with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Advancing to step 12:
If we divide 810 by 91, we get 8 and a remainder of 82.
The number 8 becomes the next digit in our result. 
Result so far: 4813.901098
The remainder is 82 after subtracting 728 from 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 13:
The number 91 fits into 820 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 4813.9010989
The remainder is 1 after subtracting 819 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 14:
If we divide 10 by 91, we get 0 and a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 4813.9010989
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 4813.9010989 with a balance of 1e-08.