We divide 398720 by 99
The aim is to understand the frequency of 99 in 398720.

Moving on to step 1:
3 divided by 99 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 99

On to step 2:
The number 99 fits into 39 0 times, leaving a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Bring next digit (8) of the dividend behind the 39 and repeat the process: 398 / 99

Moving on to step 3:
99 goes into 398 4 times with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 396 from 398 and we're left with 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 99

Advancing to step 4:
If we divide 27 by 99, we get 0 and a remainder of 27.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
The remainder is 27 after subtracting 0 from 27.
Append the next digit (2) from the dividend to 27 and continue with: 272 / 99

Going ahead to step 5:
272 divided by 99 is 2 with a remainder of 74.
The number 2 becomes the next digit in our result. 
Result so far: 402.0
The remainder is 74 after subtracting 198 from 272.
Take the next digit (0) from the dividend and append it to 74, then repeat: 740 / 99

Going ahead to step 6:
99 goes into 740 7 times with a remainder of 47.
Record the quotient 7 as the next digit in the result. 
Result so far: 4027.0
The remainder is 47 after subtracting 693 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 7:
470 divided by 99 is 4 with a remainder of 74.
Put 4 as the next digit of the answer. 
Result so far: 4027.4
If we subtract 396 from 470, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 8:
The number 99 fits into 740 7 times, leaving a remainder of 47.
Record the quotient 7 as the next digit in the result. 
Result so far: 4027.47
The remainder is 47 after subtracting 693 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 9:
99 can be fit into 470 4 times, resulting in a remainder of 74.
Record the quotient 4 as the next digit in the result. 
Result so far: 4027.474
The remainder is 74 after subtracting 396 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 10:
When dividing 740 by 99, we get 7 with a remainder of 47.
Put 7 as the next digit of the answer. 
Result so far: 4027.4747
If we take 693 away from 740, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 11:
The number 99 fits into 470 4 times, leaving a remainder of 74.
The number 4 becomes the next digit in our result. 
Result so far: 4027.47474
Subtract 396 from 470 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 12:
740 divided by 99 is 7 with a remainder of 47.
The number 7 becomes the next digit in our result. 
Result so far: 4027.474747
If we take 693 away from 740, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 13:
When dividing 470 by 99, we get 4 with a remainder of 74.
Put 4 as the next digit of the answer. 
Result so far: 4027.4747474
If we take 396 away from 470, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 14:
740 divided by 99 is 7 with a remainder of 47.
The number 7 becomes the next digit in our result. 
Result so far: 4027.47474747
Subtract 693 from 740 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

In conclusion, the division gives 4027.47474747 with a balance of 4.7e-08.