91179945 ÷ 91 
The aim is to understand the frequency of 91 in 91179945.

On to step 1:
91 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 91

Step 2:
If we divide 91 by 91, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 0 after subtracting 91 from 91.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 91

Moving on to step 3:
91 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 91

Step 4:
91 can be fit into 17 0 times, resulting in a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 100.0
If we take 0 away from 17, we end up with 17.
Fetch the next digit (9) from the dividend, attach it to 17 and continue: 179 / 91

Let's proceed to step 5:
91 goes into 179 1 times with a remainder of 88.
Use 1 as the next digit of our solution. 
Result so far: 1001.0
Subtract 91 from 179 to get 88.
Fetch the next digit (9) from the dividend, attach it to 88 and continue: 889 / 91

Let's proceed to step 6:
91 can be fit into 889 9 times, resulting in a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 10019.0
If we take 819 away from 889, we end up with 70.
Include the next digit (4) from the dividend after 70, then repeat: 704 / 91

Step 7:
91 can be fit into 704 7 times, resulting in a remainder of 67.
Record the quotient 7 as the next digit in the result. 
Result so far: 100197.0
Deduct 637 from 704 and we're left with 67.
Append the next digit (5) from the dividend to 67 and continue with: 675 / 91

Let's proceed to step 8:
675 divided by 91 is 7 with a remainder of 38.
Put 7 as the next digit of the answer. 
Result so far: 1001977.0
Deduct 637 from 675 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.

Going ahead to step 9:
If we divide 380 by 91, we get 4 and a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 1001977.4
The remainder is 16 after subtracting 364 from 380.
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 10:
91 can be fit into 160 1 times, resulting in a remainder of 69.
Write down 1 as next digit of the result. 
Result so far: 1001977.41
Deduct 91 from 160 and we're left with 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 11:
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: 1001977.417
If we subtract 637 from 690, we 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.

Let's proceed to step 12:
91 goes into 530 5 times with a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 1001977.4175
Subtracting 455 from 530 leaves us 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 13:
91 goes into 750 8 times with a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 1001977.41758
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.

On to step 14:
The number 91 fits into 220 2 times, leaving a remainder of 38.
The next digit of our result is 2. 
Result so far: 1001977.417582
The remainder is 38 after subtracting 182 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 15:
When dividing 380 by 91, we get 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 1001977.4175824
Subtract 364 from 380 to 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.

Moving on to step 16:
91 goes into 160 1 times with a remainder of 69.
Record the quotient 1 as the next digit in the result. 
Result so far: 1001977.41758241
The remainder is 69 after subtracting 91 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

The final result is 1001977.41758241 with a remainder of 6.9e-08.