We look at the division of 980213 by 91 
The aim is to understand the frequency of 91 in 980213.

On to step 1:
When dividing 9 by 91, we get 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 91

Moving on to step 2:
91 goes into 98 1 times with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 91 from 98 and we're left with 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 91

Let's proceed to step 3:
70 divided by 91 is 0 with a remainder of 70.
The next digit of our result is 0. 
Result so far: 10.0
Subtracting 0 from 70 leaves us with 70.
Take the next digit (2) from the dividend and append it to 70, then repeat: 702 / 91

Moving on to step 4:
When dividing 702 by 91, we get 7 with a remainder of 65.
Use 7 as the next digit of our solution. 
Result so far: 107.0
Subtract 637 from 702 to get 65.
Grab the next digit (1) from the dividend, add it to 65, then carry on: 651 / 91

Moving on to step 5:
The number 91 fits into 651 7 times, leaving a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 1077.0
Subtracting 637 from 651 leaves us with 14.
Take the next digit (3) from the dividend and append it to 14, then repeat: 143 / 91

On to step 6:
143 divided by 91 is 1 with a remainder of 52.
The next digit of our result is 1. 
Result so far: 10771.0
If we take 91 away from 143, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 7:
If we divide 520 by 91, we get 5 and a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 10771.5
If we subtract 455 from 520, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 8:
If we divide 650 by 91, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 10771.57
Subtracting 637 from 650 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 9:
91 goes into 130 1 times with a remainder of 39.
The next digit of our result is 1. 
Result so far: 10771.571
The remainder is 39 after subtracting 91 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 10:
91 can be fit into 390 4 times, resulting in a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 10771.5714
If we subtract 364 from 390, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 11:
260 divided by 91 is 2 with a remainder of 78.
The number 2 becomes the next digit in our result. 
Result so far: 10771.57142
The remainder is 78 after subtracting 182 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 12:
The number 91 fits into 780 8 times, leaving a remainder of 52.
The next digit of our result is 8. 
Result so far: 10771.571428
Subtracting 728 from 780 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 13:
The number 91 fits into 520 5 times, leaving a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 10771.5714285
If we take 455 away from 520, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 14:
When dividing 650 by 91, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 10771.57142857
If we take 637 away from 650, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Our division results in 10771.57142857 with a remaining 1.3e-08.