We look at the division of 504889 by 91 
The aim is to understand the frequency of 91 in 504889.

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
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (0) from the dividend, attach it to 5 and continue: 50 / 91

Going ahead to step 2:
91 goes into 50 0 times with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 50, we get 50.
Bring next digit (4) of the dividend behind the 50 and repeat the process: 504 / 91

Moving on to step 3:
If we divide 504 by 91, we get 5 and a remainder of 49.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Deduct 455 from 504 and we're left with 49.
Grab the next digit (8) from the dividend, add it to 49, then carry on: 498 / 91

Moving on to step 4:
91 can be fit into 498 5 times, resulting in a remainder of 43.
Put 5 as the next digit of the answer. 
Result so far: 55.0
Deduct 455 from 498 and we're left with 43.
Bring next digit (8) of the dividend behind the 43 and repeat the process: 438 / 91

Going ahead to step 5:
438 divided by 91 is 4 with a remainder of 74.
Use 4 as the next digit of our solution. 
Result so far: 554.0
If we subtract 364 from 438, we get 74.
Take the next digit (9) from the dividend and append it to 74, then repeat: 749 / 91

On to step 6:
749 divided by 91 is 8 with a remainder of 21.
The number 8 becomes the next digit in our result. 
Result so far: 5548.0
Deduct 728 from 749 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 7:
91 goes into 210 2 times with a remainder of 28.
The next digit of our result is 2. 
Result so far: 5548.2
The remainder is 28 after subtracting 182 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 8:
When dividing 280 by 91, we get 3 with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 5548.23
Subtracting 273 from 280 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 9:
When dividing 70 by 91, we get 0 with a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 5548.23
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 10:
91 can be fit into 700 7 times, resulting in a remainder of 63.
The next digit of our result is 7. 
Result so far: 5548.2307
If we subtract 637 from 700, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 11:
If we divide 630 by 91, we get 6 and a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 5548.23076
Deduct 546 from 630 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

On to step 12:
91 can be fit into 840 9 times, resulting in a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 5548.230769
If we subtract 819 from 840, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 13:
91 goes into 210 2 times with a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 5548.2307692
The remainder is 28 after subtracting 182 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 14:
91 can be fit into 280 3 times, resulting in a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 5548.23076923
Deduct 273 from 280 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 5548.23076923, and the remainder is 7e-09.