We look at the division of 438158 by 99 
The aim is to understand the frequency of 99 in 438158.

Going ahead to step 1:
99 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 99

Moving on to step 2:
If we divide 43 by 99, we get 0 and a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 43, we end up with 43.
Include the next digit (8) from the dividend after 43, then repeat: 438 / 99

On to step 3:
When dividing 438 by 99, we get 4 with a remainder of 42.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 396 from 438 leaves us with 42.
Fetch the next digit (1) from the dividend, attach it to 42 and continue: 421 / 99

Step 4:
99 can be fit into 421 4 times, resulting in a remainder of 25.
Use 4 as the next digit of our solution. 
Result so far: 44.0
If we subtract 396 from 421, we get 25.
Bring next digit (5) of the dividend behind the 25 and repeat the process: 255 / 99

Step 5:
If we divide 255 by 99, we get 2 and a remainder of 57.
Write down 2 as next digit of the result. 
Result so far: 442.0
Deduct 198 from 255 and we're left with 57.
Grab the next digit (8) from the dividend, add it to 57, then carry on: 578 / 99

Going ahead to step 6:
99 goes into 578 5 times with a remainder of 83.
The next digit of our result is 5. 
Result so far: 4425.0
Subtracting 495 from 578 leaves us with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Advancing to step 7:
When dividing 830 by 99, we get 8 with a remainder of 38.
Record the quotient 8 as the next digit in the result. 
Result so far: 4425.8
If we take 792 away from 830, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 8:
The number 99 fits into 380 3 times, leaving a remainder of 83.
Write down 3 as next digit of the result. 
Result so far: 4425.83
The remainder is 83 after subtracting 297 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

On to step 9:
If we divide 830 by 99, we get 8 and a remainder of 38.
Use 8 as the next digit of our solution. 
Result so far: 4425.838
Subtracting 792 from 830 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 10:
99 goes into 380 3 times with a remainder of 83.
The next digit of our result is 3. 
Result so far: 4425.8383
Subtracting 297 from 380 leaves us with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 11:
If we divide 830 by 99, we get 8 and a remainder of 38.
Use 8 as the next digit of our solution. 
Result so far: 4425.83838
Deduct 792 from 830 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 12:
If we divide 380 by 99, we get 3 and a remainder of 83.
Use 3 as the next digit of our solution. 
Result so far: 4425.838383
If we subtract 297 from 380, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Going ahead to step 13:
99 can be fit into 830 8 times, resulting in a remainder of 38.
Write down 8 as next digit of the result. 
Result so far: 4425.8383838
If we subtract 792 from 830, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 14:
99 can be fit into 380 3 times, resulting in a remainder of 83.
Put 3 as the next digit of the answer. 
Result so far: 4425.83838383
The remainder is 83 after subtracting 297 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

After the division, we end up with 4425.83838383 and a remainder of 8.3e-08.