We look at the division of 555068 by 91 
The aim is to understand the frequency of 91 in 555068.

Step 1:
91 goes into 5 0 times with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 91

Advancing to step 2:
91 can be fit into 55 0 times, resulting in a remainder of 55.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 55, we get 55.
Take the next digit (5) from the dividend and append it to 55, then repeat: 555 / 91

On to step 3:
The number 91 fits into 555 6 times, leaving a remainder of 9.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we take 546 away from 555, we end up with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 91

On to step 4:
90 divided by 91 is 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 60.0
Deduct 0 from 90 and we're left with 90.
Bring next digit (6) of the dividend behind the 90 and repeat the process: 906 / 91

On to step 5:
91 can be fit into 906 9 times, resulting in a remainder of 87.
Put 9 as the next digit of the answer. 
Result so far: 609.0
Subtracting 819 from 906 leaves us with 87.
Include the next digit (8) from the dividend after 87, then repeat: 878 / 91

On to step 6:
878 divided by 91 is 9 with a remainder of 59.
Write down 9 as next digit of the result. 
Result so far: 6099.0
Deduct 819 from 878 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 7:
The number 91 fits into 590 6 times, leaving a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 6099.6
Subtracting 546 from 590 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 8:
If we divide 440 by 91, we get 4 and a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 6099.64
Subtracting 364 from 440 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 9:
The number 91 fits into 760 8 times, leaving a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 6099.648
The remainder is 32 after subtracting 728 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 10:
When dividing 320 by 91, we get 3 with a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 6099.6483
Deduct 273 from 320 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 11:
When dividing 470 by 91, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 6099.64835
Subtracting 455 from 470 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
When dividing 150 by 91, we get 1 with a remainder of 59.
The next digit of our result is 1. 
Result so far: 6099.648351
Subtract 91 from 150 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Going ahead to step 13:
When dividing 590 by 91, we get 6 with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 6099.6483516
If we subtract 546 from 590, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 14:
91 goes into 440 4 times with a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 6099.64835164
If we subtract 364 from 440, we get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The quotient of the division is 6099.64835164, and the remainder is 7.6e-08.