We look at the division of 891821 by 28 
The aim is to understand the frequency of 28 in 891821.

Advancing to step 1:
28 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 28

On to step 2:
If we divide 89 by 28, we get 3 and a remainder of 5.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 84 from 89 and we're left with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 28

Going ahead to step 3:
If we divide 51 by 28, we get 1 and a remainder of 23.
Use 1 as the next digit of our solution. 
Result so far: 31.0
Subtract 28 from 51 to get 23.
Append the next digit (8) from the dividend to 23 and continue with: 238 / 28

Step 4:
28 goes into 238 8 times with a remainder of 14.
The next digit of our result is 8. 
Result so far: 318.0
The remainder is 14 after subtracting 224 from 238.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 28

Advancing to step 5:
142 divided by 28 is 5 with a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 3185.0
The remainder is 2 after subtracting 140 from 142.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 28

Going ahead to step 6:
21 divided by 28 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 31850.0
If we subtract 0 from 21, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 7:
28 goes into 210 7 times with a remainder of 14.
The next digit of our result is 7. 
Result so far: 31850.7
Subtract 196 from 210 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
When dividing 140 by 28, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 31850.75
The remainder is 0 after subtracting 140 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
When dividing 0 by 28, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 31850.75
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 10:
The number 28 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 31850.75
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 31850.75 with a remainder of 0.0.