We look at the division of 135199 by 28 
The aim is to understand the frequency of 28 in 135199.

Let's proceed to step 1:
28 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 28

Step 2:
When dividing 13 by 28, we get 0 with a remainder of 13.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Grab the next digit (5) from the dividend, add it to 13, then carry on: 135 / 28

On to step 3:
28 goes into 135 4 times with a remainder of 23.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 112 from 135 leaves us with 23.
Fetch the next digit (1) from the dividend, attach it to 23 and continue: 231 / 28

Going ahead to step 4:
When dividing 231 by 28, we get 8 with a remainder of 7.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
Subtract 224 from 231 to get 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 28

On to step 5:
28 can be fit into 79 2 times, resulting in a remainder of 23.
Use 2 as the next digit of our solution. 
Result so far: 482.0
If we take 56 away from 79, we end up with 23.
Fetch the next digit (9) from the dividend, attach it to 23 and continue: 239 / 28

Advancing to step 6:
239 divided by 28 is 8 with a remainder of 15.
Write down 8 as next digit of the result. 
Result so far: 4828.0
Deduct 224 from 239 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
28 goes into 150 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 4828.5
The remainder is 10 after subtracting 140 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
28 can be fit into 100 3 times, resulting in a remainder of 16.
Record the quotient 3 as the next digit in the result. 
Result so far: 4828.53
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 9:
If we divide 160 by 28, we get 5 and a remainder of 20.
The next digit of our result is 5. 
Result so far: 4828.535
The remainder is 20 after subtracting 140 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 10:
200 divided by 28 is 7 with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 4828.5357
The remainder is 4 after subtracting 196 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
28 goes into 40 1 times with a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 4828.53571
Subtract 28 from 40 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 12:
28 can be fit into 120 4 times, resulting in a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 4828.535714
Subtract 112 from 120 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.

Going ahead to step 13:
If we divide 80 by 28, we get 2 and a remainder of 24.
The next digit of our result is 2. 
Result so far: 4828.5357142
The remainder is 24 after subtracting 56 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 14:
28 goes into 240 8 times with a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 4828.53571428
Deduct 224 from 240 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 4828.53571428 and a remainder of 1.6e-08.