Let's divide 428629 by 99
The aim is to understand the frequency of 99 in 428629.

Going ahead to step 1:
When dividing 4 by 99, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 99

Moving on to step 2:
If we divide 42 by 99, we get 0 and a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Append the next digit (8) from the dividend to 42 and continue with: 428 / 99

Step 3:
The number 99 fits into 428 4 times, leaving a remainder of 32.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 396 away from 428, we end up with 32.
Include the next digit (6) from the dividend after 32, then repeat: 326 / 99

Going ahead to step 4:
When dividing 326 by 99, we get 3 with a remainder of 29.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
Subtracting 297 from 326 leaves us with 29.
Bring next digit (2) of the dividend behind the 29 and repeat the process: 292 / 99

Moving on to step 5:
292 divided by 99 is 2 with a remainder of 94.
Use 2 as the next digit of our solution. 
Result so far: 432.0
If we subtract 198 from 292, we get 94.
Bring next digit (9) of the dividend behind the 94 and repeat the process: 949 / 99

Advancing to step 6:
99 goes into 949 9 times with a remainder of 58.
Write down 9 as next digit of the result. 
Result so far: 4329.0
Subtract 891 from 949 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 7:
If we divide 580 by 99, we get 5 and a remainder of 85.
Write down 5 as next digit of the result. 
Result so far: 4329.5
Deduct 495 from 580 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Moving on to step 8:
If we divide 850 by 99, we get 8 and a remainder of 58.
The number 8 becomes the next digit in our result. 
Result so far: 4329.58
If we take 792 away from 850, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 9:
If we divide 580 by 99, we get 5 and a remainder of 85.
Put 5 as the next digit of the answer. 
Result so far: 4329.585
Deduct 495 from 580 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Let's proceed to step 10:
99 can be fit into 850 8 times, resulting in a remainder of 58.
Record the quotient 8 as the next digit in the result. 
Result so far: 4329.5858
Deduct 792 from 850 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 11:
580 divided by 99 is 5 with a remainder of 85.
Record the quotient 5 as the next digit in the result. 
Result so far: 4329.58585
Subtracting 495 from 580 leaves us with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

On to step 12:
When dividing 850 by 99, we get 8 with a remainder of 58.
Record the quotient 8 as the next digit in the result. 
Result so far: 4329.585858
If we take 792 away from 850, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 13:
99 goes into 580 5 times with a remainder of 85.
The next digit of our result is 5. 
Result so far: 4329.5858585
If we subtract 495 from 580, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Advancing to step 14:
The number 99 fits into 850 8 times, leaving a remainder of 58.
Record the quotient 8 as the next digit in the result. 
Result so far: 4329.58585858
If we subtract 792 from 850, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

The final outcome is 4329.58585858, with a leftover of 5.8e-08.