We look at the division of 308646 by 28 
The aim is to understand the frequency of 28 in 308646.

Advancing to step 1:
3 divided by 28 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 28

Going ahead to step 2:
If we divide 30 by 28, we get 1 and a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 28 from 30 leaves us with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 28

Moving on to step 3:
28 goes into 28 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtracting 28 from 28 leaves us with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 28

On to step 4:
If we divide 6 by 28, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 110.0
Subtract 0 from 6 to get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 28

Advancing to step 5:
If we divide 64 by 28, we get 2 and a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 1102.0
The remainder is 8 after subtracting 56 from 64.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 28

Moving on to step 6:
28 can be fit into 86 3 times, resulting in a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 11023.0
If we take 84 away from 86, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
28 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 11023.0
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
28 goes into 200 7 times with a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 11023.07
If we subtract 196 from 200, we get 4.
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 9:
The number 28 fits into 40 1 times, leaving a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 11023.071
If we take 28 away from 40, we end up with 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 10:
120 divided by 28 is 4 with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 11023.0714
Deduct 112 from 120 and we're left with 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 11:
The number 28 fits into 80 2 times, leaving a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 11023.07142
If we subtract 56 from 80, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 12:
If we divide 240 by 28, we get 8 and a remainder of 16.
The next digit of our result is 8. 
Result so far: 11023.071428
If we subtract 224 from 240, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 13:
28 can be fit into 160 5 times, resulting in a remainder of 20.
The next digit of our result is 5. 
Result so far: 11023.0714285
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 14:
28 goes into 200 7 times with a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 11023.07142857
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.

After the division, we end up with 11023.07142857 and a remainder of 4e-09.