We divide 505576 by 91
The aim is to understand the frequency of 91 in 505576.

Going ahead to 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
If we take 0 away from 5, we end up with 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 91

Advancing to step 2:
91 can be fit into 50 0 times, resulting in a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 50, we end up with 50.
Bring next digit (5) of the dividend behind the 50 and repeat the process: 505 / 91

Advancing to step 3:
The number 91 fits into 505 5 times, leaving a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 455 from 505, we get 50.
Append the next digit (5) from the dividend to 50 and continue with: 505 / 91

Step 4:
91 can be fit into 505 5 times, resulting in a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 55.0
If we take 455 away from 505, we end up with 50.
Take the next digit (7) from the dividend and append it to 50, then repeat: 507 / 91

Moving on to step 5:
If we divide 507 by 91, we get 5 and a remainder of 52.
Use 5 as the next digit of our solution. 
Result so far: 555.0
If we subtract 455 from 507, we get 52.
Bring next digit (6) of the dividend behind the 52 and repeat the process: 526 / 91

On to step 6:
The number 91 fits into 526 5 times, leaving a remainder of 71.
Put 5 as the next digit of the answer. 
Result so far: 5555.0
If we take 455 away from 526, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Moving on to step 7:
91 can be fit into 710 7 times, resulting in a remainder of 73.
The next digit of our result is 7. 
Result so far: 5555.7
Deduct 637 from 710 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 8:
730 divided by 91 is 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 5555.78
If we take 728 away from 730, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
When dividing 20 by 91, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 5555.78
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 10:
When dividing 200 by 91, we get 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 5555.7802
The remainder is 18 after subtracting 182 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 11:
180 divided by 91 is 1 with a remainder of 89.
The number 1 becomes the next digit in our result. 
Result so far: 5555.78021
Subtracting 91 from 180 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Moving on to step 12:
The number 91 fits into 890 9 times, leaving a remainder of 71.
Write down 9 as next digit of the result. 
Result so far: 5555.780219
If we take 819 away from 890, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 13:
91 can be fit into 710 7 times, resulting in a remainder of 73.
Use 7 as the next digit of our solution. 
Result so far: 5555.7802197
Subtract 637 from 710 to get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Going ahead to step 14:
91 can be fit into 730 8 times, resulting in a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 5555.78021978
If we take 728 away from 730, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 5555.78021978, with a leftover of 2e-09.