78073 divided by 91 
The aim is to understand the frequency of 91 in 78073.

Moving on to step 1:
When dividing 7 by 91, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 91

Let's proceed to step 2:
91 goes into 78 0 times with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Include the next digit (0) from the dividend after 78, then repeat: 780 / 91

On to step 3:
91 can be fit into 780 8 times, resulting in a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 728 away from 780, we end up with 52.
Fetch the next digit (7) from the dividend, attach it to 52 and continue: 527 / 91

Let's proceed to step 4:
The number 91 fits into 527 5 times, leaving a remainder of 72.
Put 5 as the next digit of the answer. 
Result so far: 85.0
Subtract 455 from 527 to get 72.
Grab the next digit (3) from the dividend, add it to 72, then carry on: 723 / 91

Advancing to step 5:
91 goes into 723 7 times with a remainder of 86.
The number 7 becomes the next digit in our result. 
Result so far: 857.0
Deduct 637 from 723 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Moving on to step 6:
91 can be fit into 860 9 times, resulting in a remainder of 41.
The next digit of our result is 9. 
Result so far: 857.9
The remainder is 41 after subtracting 819 from 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 7:
When dividing 410 by 91, we get 4 with a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 857.94
If we subtract 364 from 410, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 8:
91 can be fit into 460 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 857.945
If we subtract 455 from 460, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 9:
The number 91 fits into 50 0 times, leaving a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 857.945
If we take 0 away from 50, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 10:
The number 91 fits into 500 5 times, leaving a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 857.94505
Subtracting 455 from 500 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 11:
91 goes into 450 4 times with a remainder of 86.
Record the quotient 4 as the next digit in the result. 
Result so far: 857.945054
Deduct 364 from 450 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Step 12:
91 can be fit into 860 9 times, resulting in a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 857.9450549
The remainder is 41 after subtracting 819 from 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 13:
91 goes into 410 4 times with a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 857.94505494
Deduct 364 from 410 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

After the division, we end up with 857.94505494 and a remainder of 4.6e-08.