Let's divide 71072211 by 991
The aim is to understand the frequency of 991 in 71072211.

Step 1:
When dividing 7 by 991, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 991

Moving on to step 2:
991 goes into 71 0 times with a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 71 to get 71.
Fetch the next digit (0) from the dividend, attach it to 71 and continue: 710 / 991

Advancing to step 3:
710 divided by 991 is 0 with a remainder of 710.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 710 leaves us with 710.
Take the next digit (7) from the dividend and append it to 710, then repeat: 7107 / 991

On to step 4:
7107 divided by 991 is 7 with a remainder of 170.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 6937 from 7107, we get 170.
Take the next digit (2) from the dividend and append it to 170, then repeat: 1702 / 991

Going ahead to step 5:
1702 divided by 991 is 1 with a remainder of 711.
Put 1 as the next digit of the answer. 
Result so far: 71.0
The remainder is 711 after subtracting 991 from 1702.
Bring next digit (2) of the dividend behind the 711 and repeat the process: 7112 / 991

Going ahead to step 6:
7112 divided by 991 is 7 with a remainder of 175.
The next digit of our result is 7. 
Result so far: 717.0
The remainder is 175 after subtracting 6937 from 7112.
Fetch the next digit (1) from the dividend, attach it to 175 and continue: 1751 / 991

Advancing to step 7:
When dividing 1751 by 991, we get 1 with a remainder of 760.
The number 1 becomes the next digit in our result. 
Result so far: 7171.0
The remainder is 760 after subtracting 991 from 1751.
Grab the next digit (1) from the dividend, add it to 760, then carry on: 7601 / 991

Let's proceed to step 8:
If we divide 7601 by 991, we get 7 and a remainder of 664.
Put 7 as the next digit of the answer. 
Result so far: 71717.0
Subtract 6937 from 7601 to get 664.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6640, and continue the process.

Advancing to step 9:
If we divide 6640 by 991, we get 6 and a remainder of 694.
Use 6 as the next digit of our solution. 
Result so far: 71717.6
If we take 5946 away from 6640, we end up with 694.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6940, and continue the process.

Going ahead to step 10:
991 can be fit into 6940 7 times, resulting in a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 71717.67
Deduct 6937 from 6940 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 11:
If we divide 30 by 991, we get 0 and a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 71717.67
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 12:
300 divided by 991 is 0 with a remainder of 300.
Record the quotient 0 as the next digit in the result. 
Result so far: 71717.67
Deduct 0 from 300 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

After the division, we end up with 71717.67 and a remainder of 0.003.