721935 divided by 99 
The aim is to understand the frequency of 99 in 721935.

Let's proceed to step 1:
When dividing 7 by 99, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 99

Advancing to step 2:
When dividing 72 by 99, we get 0 with a remainder of 72.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Grab the next digit (1) from the dividend, add it to 72, then carry on: 721 / 99

On to step 3:
The number 99 fits into 721 7 times, leaving a remainder of 28.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtract 693 from 721 to get 28.
Fetch the next digit (9) from the dividend, attach it to 28 and continue: 289 / 99

Step 4:
When dividing 289 by 99, we get 2 with a remainder of 91.
Put 2 as the next digit of the answer. 
Result so far: 72.0
If we subtract 198 from 289, we get 91.
Take the next digit (3) from the dividend and append it to 91, then repeat: 913 / 99

Let's proceed to step 5:
The number 99 fits into 913 9 times, leaving a remainder of 22.
Use 9 as the next digit of our solution. 
Result so far: 729.0
Subtracting 891 from 913 leaves us with 22.
Fetch the next digit (5) from the dividend, attach it to 22 and continue: 225 / 99

On to step 6:
99 can be fit into 225 2 times, resulting in a remainder of 27.
The next digit of our result is 2. 
Result so far: 7292.0
If we take 198 away from 225, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 7:
99 can be fit into 270 2 times, resulting in a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 7292.2
Deduct 198 from 270 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 8:
99 can be fit into 720 7 times, resulting in a remainder of 27.
Record the quotient 7 as the next digit in the result. 
Result so far: 7292.27
The remainder is 27 after subtracting 693 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 9:
The number 99 fits into 270 2 times, leaving a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 7292.272
Deduct 198 from 270 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 10:
99 goes into 720 7 times with a remainder of 27.
The number 7 becomes the next digit in our result. 
Result so far: 7292.2727
Deduct 693 from 720 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 11:
99 goes into 270 2 times with a remainder of 72.
The number 2 becomes the next digit in our result. 
Result so far: 7292.27272
Subtracting 198 from 270 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 12:
If we divide 720 by 99, we get 7 and a remainder of 27.
The number 7 becomes the next digit in our result. 
Result so far: 7292.272727
The remainder is 27 after subtracting 693 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 13:
If we divide 270 by 99, we get 2 and a remainder of 72.
Write down 2 as next digit of the result. 
Result so far: 7292.2727272
If we subtract 198 from 270, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 14:
99 can be fit into 720 7 times, resulting in a remainder of 27.
The number 7 becomes the next digit in our result. 
Result so far: 7292.27272727
The remainder is 27 after subtracting 693 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Our division results in 7292.27272727 with a remaining 2.7e-08.