173371 ÷ 91 
The aim is to understand the frequency of 91 in 173371.

Step 1:
When dividing 1 by 91, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 91

On to step 2:
17 divided by 91 is 0 with a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 17 and we're left with 17.
Grab the next digit (3) from the dividend, add it to 17, then carry on: 173 / 91

Advancing to step 3:
91 goes into 173 1 times with a remainder of 82.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 91 from 173 leaves us with 82.
Grab the next digit (3) from the dividend, add it to 82, then carry on: 823 / 91

Advancing to step 4:
823 divided by 91 is 9 with a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
Subtracting 819 from 823 leaves us with 4.
Fetch the next digit (7) from the dividend, attach it to 4 and continue: 47 / 91

Let's proceed to step 5:
The number 91 fits into 47 0 times, leaving a remainder of 47.
Put 0 as the next digit of the answer. 
Result so far: 190.0
The remainder is 47 after subtracting 0 from 47.
Include the next digit (1) from the dividend after 47, then repeat: 471 / 91

Going ahead to step 6:
91 goes into 471 5 times with a remainder of 16.
Put 5 as the next digit of the answer. 
Result so far: 1905.0
If we subtract 455 from 471, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
The number 91 fits into 160 1 times, leaving a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 1905.1
If we subtract 91 from 160, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 8:
91 goes into 690 7 times with a remainder of 53.
The number 7 becomes the next digit in our result. 
Result so far: 1905.17
Subtract 637 from 690 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Going ahead to step 9:
91 can be fit into 530 5 times, resulting in a remainder of 75.
Write down 5 as next digit of the result. 
Result so far: 1905.175
Deduct 455 from 530 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 10:
When dividing 750 by 91, we get 8 with a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 1905.1758
If we take 728 away from 750, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 11:
91 can be fit into 220 2 times, resulting in a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 1905.17582
Deduct 182 from 220 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 12:
91 can be fit into 380 4 times, resulting in a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 1905.175824
Deduct 364 from 380 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 13:
91 can be fit into 160 1 times, resulting in a remainder of 69.
The next digit of our result is 1. 
Result so far: 1905.1758241
Subtract 91 from 160 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 14:
If we divide 690 by 91, we get 7 and a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 1905.17582417
Deduct 637 from 690 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Our division results in 1905.17582417 with a remaining 5.3e-08.