We look at the division of 577394 by 91 
The aim is to understand the frequency of 91 in 577394.

Going ahead to step 1:
If we divide 5 by 91, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 91

Going ahead to step 2:
91 goes into 57 0 times with a remainder of 57.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 57, we end up with 57.
Include the next digit (7) from the dividend after 57, then repeat: 577 / 91

Step 3:
91 goes into 577 6 times with a remainder of 31.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 546 from 577 leaves us with 31.
Fetch the next digit (3) from the dividend, attach it to 31 and continue: 313 / 91

Let's proceed to step 4:
91 goes into 313 3 times with a remainder of 40.
Write down 3 as next digit of the result. 
Result so far: 63.0
The remainder is 40 after subtracting 273 from 313.
Append the next digit (9) from the dividend to 40 and continue with: 409 / 91

Let's proceed to step 5:
409 divided by 91 is 4 with a remainder of 45.
Write down 4 as next digit of the result. 
Result so far: 634.0
Deduct 364 from 409 and we're left with 45.
Fetch the next digit (4) from the dividend, attach it to 45 and continue: 454 / 91

Moving on to step 6:
91 goes into 454 4 times with a remainder of 90.
Use 4 as the next digit of our solution. 
Result so far: 6344.0
Deduct 364 from 454 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 7:
91 can be fit into 900 9 times, resulting in a remainder of 81.
Use 9 as the next digit of our solution. 
Result so far: 6344.9
Subtracting 819 from 900 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Going ahead to step 8:
When dividing 810 by 91, we get 8 with a remainder of 82.
The number 8 becomes the next digit in our result. 
Result so far: 6344.98
The remainder is 82 after subtracting 728 from 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 9:
If we divide 820 by 91, we get 9 and a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 6344.989
Subtract 819 from 820 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 10:
91 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 6344.989
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 11:
If we divide 100 by 91, we get 1 and a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 6344.98901
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 12:
If we divide 90 by 91, we get 0 and a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 6344.98901
If we subtract 0 from 90, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Moving on to step 13:
When dividing 900 by 91, we get 9 with a remainder of 81.
Write down 9 as next digit of the result. 
Result so far: 6344.9890109
Subtracting 819 from 900 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 14:
91 can be fit into 810 8 times, resulting in a remainder of 82.
Record the quotient 8 as the next digit in the result. 
Result so far: 6344.98901098
If we take 728 away from 810, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

The quotient of the division is 6344.98901098, and the remainder is 8.2e-08.