We look at the division of 27909230 by 991 
The aim is to understand the frequency of 991 in 27909230.

Going ahead to step 1:
When dividing 2 by 991, we get 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 991

Advancing to step 2:
The number 991 fits into 27 0 times, leaving a remainder of 27.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 27 after subtracting 0 from 27.
Append the next digit (9) from the dividend to 27 and continue with: 279 / 991

On to step 3:
279 divided by 991 is 0 with a remainder of 279.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 279, we end up with 279.
Fetch the next digit (0) from the dividend, attach it to 279 and continue: 2790 / 991

Step 4:
The number 991 fits into 2790 2 times, leaving a remainder of 808.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 1982 from 2790, we get 808.
Include the next digit (9) from the dividend after 808, then repeat: 8089 / 991

Let's proceed to step 5:
991 goes into 8089 8 times with a remainder of 161.
The next digit of our result is 8. 
Result so far: 28.0
If we subtract 7928 from 8089, we get 161.
Include the next digit (2) from the dividend after 161, then repeat: 1612 / 991

On to step 6:
991 can be fit into 1612 1 times, resulting in a remainder of 621.
Write down 1 as next digit of the result. 
Result so far: 281.0
If we subtract 991 from 1612, we get 621.
Grab the next digit (3) from the dividend, add it to 621, then carry on: 6213 / 991

Advancing to step 7:
991 goes into 6213 6 times with a remainder of 267.
Write down 6 as next digit of the result. 
Result so far: 2816.0
Subtracting 5946 from 6213 leaves us with 267.
Fetch the next digit (0) from the dividend, attach it to 267 and continue: 2670 / 991

On to step 8:
991 can be fit into 2670 2 times, resulting in a remainder of 688.
Use 2 as the next digit of our solution. 
Result so far: 28162.0
Deduct 1982 from 2670 and we're left with 688.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6880, and continue the process.

Advancing to step 9:
6880 divided by 991 is 6 with a remainder of 934.
Record the quotient 6 as the next digit in the result. 
Result so far: 28162.6
If we subtract 5946 from 6880, we get 934.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9340, and continue the process.

Going ahead to step 10:
If we divide 9340 by 991, we get 9 and a remainder of 421.
Put 9 as the next digit of the answer. 
Result so far: 28162.69
Subtracting 8919 from 9340 leaves us with 421.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4210, and continue the process.

Advancing to step 11:
4210 divided by 991 is 4 with a remainder of 246.
Write down 4 as next digit of the result. 
Result so far: 28162.694
Subtracting 3964 from 4210 leaves us with 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Moving on to step 12:
2460 divided by 991 is 2 with a remainder of 478.
The next digit of our result is 2. 
Result so far: 28162.6942
If we take 1982 away from 2460, we end up with 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Step 13:
The number 991 fits into 4780 4 times, leaving a remainder of 816.
The number 4 becomes the next digit in our result. 
Result so far: 28162.69424
Subtracting 3964 from 4780 leaves us with 816.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8160, and continue the process.

Going ahead to step 14:
If we divide 8160 by 991, we get 8 and a remainder of 232.
Record the quotient 8 as the next digit in the result. 
Result so far: 28162.694248
If we subtract 7928 from 8160, we get 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Moving on to step 15:
991 can be fit into 2320 2 times, resulting in a remainder of 338.
Use 2 as the next digit of our solution. 
Result so far: 28162.6942482
Subtracting 1982 from 2320 leaves us with 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Step 16:
If we divide 3380 by 991, we get 3 and a remainder of 407.
The number 3 becomes the next digit in our result. 
Result so far: 28162.69424823
The remainder is 407 after subtracting 2973 from 3380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

Our division results in 28162.69424823 with a remaining 4.07e-07.