55566 divided by 91 
The aim is to understand the frequency of 91 in 55566.

Step 1:
When dividing 5 by 91, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 91

Moving on to step 2:
91 can be fit into 55 0 times, resulting in a remainder of 55.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 55 leaves us with 55.
Include the next digit (5) from the dividend after 55, then repeat: 555 / 91

Let's proceed to step 3:
The number 91 fits into 555 6 times, leaving a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtract 546 from 555 to get 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 91

Advancing to step 4:
When dividing 96 by 91, we get 1 with a remainder of 5.
The next digit of our result is 1. 
Result so far: 61.0
The remainder is 5 after subtracting 91 from 96.
Include the next digit (6) from the dividend after 5, then repeat: 56 / 91

Going ahead to step 5:
91 goes into 56 0 times with a remainder of 56.
Put 0 as the next digit of the answer. 
Result so far: 610.0
Deduct 0 from 56 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 6:
560 divided by 91 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 610.6
Subtract 546 from 560 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 7:
When dividing 140 by 91, we get 1 with a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 610.61
Subtracting 91 from 140 leaves us with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 8:
If we divide 490 by 91, we get 5 and a remainder of 35.
The next digit of our result is 5. 
Result so far: 610.615
Subtracting 455 from 490 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 9:
91 can be fit into 350 3 times, resulting in a remainder of 77.
The number 3 becomes the next digit in our result. 
Result so far: 610.6153
If we take 273 away from 350, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

On to step 10:
91 goes into 770 8 times with a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 610.61538
Subtracting 728 from 770 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 11:
420 divided by 91 is 4 with a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 610.615384
Subtracting 364 from 420 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 12:
91 can be fit into 560 6 times, resulting in a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 610.6153846
Subtracting 546 from 560 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
91 goes into 140 1 times with a remainder of 49.
The next digit of our result is 1. 
Result so far: 610.61538461
Deduct 91 from 140 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

The final outcome is 610.61538461, with a leftover of 4.9e-08.