721988 ÷ 99 
The aim is to understand the frequency of 99 in 721988.

Going ahead to step 1:
99 can be fit into 7 0 times, resulting in a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 99

Advancing to step 2:
When dividing 72 by 99, we get 0 with a remainder of 72.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 72 leaves us with 72.
Append the next digit (1) from the dividend to 72 and continue with: 721 / 99

Moving on to step 3:
When dividing 721 by 99, we get 7 with a remainder of 28.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 693 from 721, we get 28.
Append the next digit (9) from the dividend to 28 and continue with: 289 / 99

Moving on to step 4:
99 goes into 289 2 times with a remainder of 91.
Use 2 as the next digit of our solution. 
Result so far: 72.0
Subtract 198 from 289 to get 91.
Bring next digit (8) of the dividend behind the 91 and repeat the process: 918 / 99

Let's proceed to step 5:
If we divide 918 by 99, we get 9 and a remainder of 27.
Write down 9 as next digit of the result. 
Result so far: 729.0
If we subtract 891 from 918, we get 27.
Bring next digit (8) of the dividend behind the 27 and repeat the process: 278 / 99

Going ahead to step 6:
278 divided by 99 is 2 with a remainder of 80.
Use 2 as the next digit of our solution. 
Result so far: 7292.0
Deduct 198 from 278 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 7:
800 divided by 99 is 8 with a remainder of 8.
Use 8 as the next digit of our solution. 
Result so far: 7292.8
If we subtract 792 from 800, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
99 can be fit into 80 0 times, resulting in a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 7292.8
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 9:
99 goes into 800 8 times with a remainder of 8.
Use 8 as the next digit of our solution. 
Result so far: 7292.808
Subtract 792 from 800 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
If we divide 80 by 99, we get 0 and a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 7292.808
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 11:
The number 99 fits into 800 8 times, leaving a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 7292.80808
If we subtract 792 from 800, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 12:
If we divide 80 by 99, we get 0 and a remainder of 80.
The next digit of our result is 0. 
Result so far: 7292.80808
If we take 0 away from 80, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 13:
If we divide 800 by 99, we get 8 and a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 7292.8080808
Deduct 792 from 800 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 14:
If we divide 80 by 99, we get 0 and a remainder of 80.
The next digit of our result is 0. 
Result so far: 7292.8080808
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final outcome is 7292.8080808, with a leftover of 8e-08.