We're dividing 169981 by 91 
The aim is to understand the frequency of 91 in 169981.

Let's proceed to step 1:
91 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 91

Moving on to step 2:
16 divided by 91 is 0 with a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Include the next digit (9) from the dividend after 16, then repeat: 169 / 91

On to step 3:
If we divide 169 by 91, we get 1 and a remainder of 78.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 91 away from 169, we end up with 78.
Include the next digit (9) from the dividend after 78, then repeat: 789 / 91

Advancing to step 4:
789 divided by 91 is 8 with a remainder of 61.
Use 8 as the next digit of our solution. 
Result so far: 18.0
Subtracting 728 from 789 leaves us with 61.
Fetch the next digit (8) from the dividend, attach it to 61 and continue: 618 / 91

Going ahead to step 5:
If we divide 618 by 91, we get 6 and a remainder of 72.
Write down 6 as next digit of the result. 
Result so far: 186.0
Subtract 546 from 618 to get 72.
Fetch the next digit (1) from the dividend, attach it to 72 and continue: 721 / 91

On to step 6:
The number 91 fits into 721 7 times, leaving a remainder of 84.
Use 7 as the next digit of our solution. 
Result so far: 1867.0
If we subtract 637 from 721, 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.

Step 7:
If we divide 840 by 91, we get 9 and a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 1867.9
If we take 819 away from 840, we end up 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.

On to step 8:
The number 91 fits into 210 2 times, leaving a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 1867.92
Deduct 182 from 210 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 9:
91 can be fit into 280 3 times, resulting in a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 1867.923
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 10:
91 goes into 70 0 times with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 1867.923
Subtracting 0 from 70 leaves us 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.

Moving on to step 11:
The number 91 fits into 700 7 times, leaving a remainder of 63.
Use 7 as the next digit of our solution. 
Result so far: 1867.92307
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.

Let's proceed to step 12:
If we divide 630 by 91, we get 6 and a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 1867.923076
Subtract 546 from 630 to 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 13:
The number 91 fits into 840 9 times, leaving a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 1867.9230769
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.

Moving on to step 14:
91 can be fit into 210 2 times, resulting in a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 1867.92307692
Deduct 182 from 210 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The quotient of the division is 1867.92307692, and the remainder is 2.8e-08.