We look at the division of 570308 by 91 
The aim is to understand the frequency of 91 in 570308.

Moving on to step 1:
The number 91 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 91

On to step 2:
91 can be fit into 57 0 times, resulting in a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 57 leaves us with 57.
Append the next digit (0) from the dividend to 57 and continue with: 570 / 91

Advancing to step 3:
The number 91 fits into 570 6 times, leaving a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 546 from 570, we get 24.
Bring next digit (3) of the dividend behind the 24 and repeat the process: 243 / 91

Going ahead to step 4:
If we divide 243 by 91, we get 2 and a remainder of 61.
Use 2 as the next digit of our solution. 
Result so far: 62.0
If we subtract 182 from 243, we get 61.
Fetch the next digit (0) from the dividend, attach it to 61 and continue: 610 / 91

Step 5:
If we divide 610 by 91, we get 6 and a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 626.0
If we take 546 away from 610, we end up with 64.
Grab the next digit (8) from the dividend, add it to 64, then carry on: 648 / 91

Going ahead to step 6:
648 divided by 91 is 7 with a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 6267.0
If we subtract 637 from 648, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
110 divided by 91 is 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 6267.1
If we subtract 91 from 110, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 8:
When dividing 190 by 91, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 6267.12
Deduct 182 from 190 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
The number 91 fits into 80 0 times, leaving a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 6267.12
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 10:
800 divided by 91 is 8 with a remainder of 72.
Put 8 as the next digit of the answer. 
Result so far: 6267.1208
Deduct 728 from 800 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 11:
91 goes into 720 7 times with a remainder of 83.
Write down 7 as next digit of the result. 
Result so far: 6267.12087
Subtract 637 from 720 to get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Going ahead to step 12:
The number 91 fits into 830 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 6267.120879
Subtracting 819 from 830 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 13:
110 divided by 91 is 1 with a remainder of 19.
The next digit of our result is 1. 
Result so far: 6267.1208791
If we subtract 91 from 110, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 14:
91 goes into 190 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 6267.12087912
If we take 182 away from 190, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The quotient of the division is 6267.12087912, and the remainder is 8e-09.