39855 ÷ 99 
The aim is to understand the frequency of 99 in 39855.

Advancing to step 1:
The number 99 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 99

On to step 2:
The number 99 fits into 39 0 times, leaving a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Bring next digit (8) of the dividend behind the 39 and repeat the process: 398 / 99

Going ahead to step 3:
398 divided by 99 is 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 2 after subtracting 396 from 398.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 99

Going ahead to step 4:
99 goes into 25 0 times with a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 40.0
The remainder is 25 after subtracting 0 from 25.
Grab the next digit (5) from the dividend, add it to 25, then carry on: 255 / 99

Moving on to step 5:
The number 99 fits into 255 2 times, leaving a remainder of 57.
Record the quotient 2 as the next digit in the result. 
Result so far: 402.0
Subtracting 198 from 255 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 6:
If we divide 570 by 99, we get 5 and a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 402.5
Subtract 495 from 570 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 7:
99 goes into 750 7 times with a remainder of 57.
Write down 7 as next digit of the result. 
Result so far: 402.57
If we subtract 693 from 750, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 8:
570 divided by 99 is 5 with a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 402.575
The remainder is 75 after subtracting 495 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Going ahead to step 9:
The number 99 fits into 750 7 times, leaving a remainder of 57.
The number 7 becomes the next digit in our result. 
Result so far: 402.5757
Deduct 693 from 750 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 10:
The number 99 fits into 570 5 times, leaving a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 402.57575
Subtract 495 from 570 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 11:
750 divided by 99 is 7 with a remainder of 57.
The next digit of our result is 7. 
Result so far: 402.575757
If we subtract 693 from 750, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 12:
When dividing 570 by 99, we get 5 with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 402.5757575
The remainder is 75 after subtracting 495 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 13:
The number 99 fits into 750 7 times, leaving a remainder of 57.
Write down 7 as next digit of the result. 
Result so far: 402.57575757
Deduct 693 from 750 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

In conclusion, the division gives 402.57575757 with a balance of 5.7e-08.