We look at the division of 52091282 by 991 
The aim is to understand the frequency of 991 in 52091282.

Advancing to step 1:
When dividing 5 by 991, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 991

Moving on to step 2:
991 goes into 52 0 times with a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 52 to get 52.
Fetch the next digit (0) from the dividend, attach it to 52 and continue: 520 / 991

Advancing to step 3:
520 divided by 991 is 0 with a remainder of 520.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 520 to get 520.
Fetch the next digit (9) from the dividend, attach it to 520 and continue: 5209 / 991

Moving on to step 4:
991 goes into 5209 5 times with a remainder of 254.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 254 after subtracting 4955 from 5209.
Grab the next digit (1) from the dividend, add it to 254, then carry on: 2541 / 991

Moving on to step 5:
991 can be fit into 2541 2 times, resulting in a remainder of 559.
Use 2 as the next digit of our solution. 
Result so far: 52.0
Deduct 1982 from 2541 and we're left with 559.
Bring next digit (2) of the dividend behind the 559 and repeat the process: 5592 / 991

Step 6:
When dividing 5592 by 991, we get 5 with a remainder of 637.
Record the quotient 5 as the next digit in the result. 
Result so far: 525.0
Subtracting 4955 from 5592 leaves us with 637.
Append the next digit (8) from the dividend to 637 and continue with: 6378 / 991

Moving on to step 7:
The number 991 fits into 6378 6 times, leaving a remainder of 432.
The number 6 becomes the next digit in our result. 
Result so far: 5256.0
Subtracting 5946 from 6378 leaves us with 432.
Append the next digit (2) from the dividend to 432 and continue with: 4322 / 991

Going ahead to step 8:
If we divide 4322 by 991, we get 4 and a remainder of 358.
The number 4 becomes the next digit in our result. 
Result so far: 52564.0
Subtract 3964 from 4322 to get 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Step 9:
991 goes into 3580 3 times with a remainder of 607.
The next digit of our result is 3. 
Result so far: 52564.3
The remainder is 607 after subtracting 2973 from 3580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6070, and continue the process.

Step 10:
991 goes into 6070 6 times with a remainder of 124.
Record the quotient 6 as the next digit in the result. 
Result so far: 52564.36
If we subtract 5946 from 6070, we get 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Let's proceed to step 11:
When dividing 1240 by 991, we get 1 with a remainder of 249.
The next digit of our result is 1. 
Result so far: 52564.361
Subtract 991 from 1240 to get 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

Advancing to step 12:
When dividing 2490 by 991, we get 2 with a remainder of 508.
Record the quotient 2 as the next digit in the result. 
Result so far: 52564.3612
Subtracting 1982 from 2490 leaves us with 508.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5080, and continue the process.

Advancing to step 13:
The number 991 fits into 5080 5 times, leaving a remainder of 125.
Record the quotient 5 as the next digit in the result. 
Result so far: 52564.36125
Subtracting 4955 from 5080 leaves us with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Moving on to step 14:
1250 divided by 991 is 1 with a remainder of 259.
Record the quotient 1 as the next digit in the result. 
Result so far: 52564.361251
If we take 991 away from 1250, we end up with 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Step 15:
991 goes into 2590 2 times with a remainder of 608.
The next digit of our result is 2. 
Result so far: 52564.3612512
If we take 1982 away from 2590, we end up with 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Let's proceed to step 16:
When dividing 6080 by 991, we get 6 with a remainder of 134.
Put 6 as the next digit of the answer. 
Result so far: 52564.36125126
Subtract 5946 from 6080 to get 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Our division results in 52564.36125126 with a remaining 1.34e-07.