We look at the division of 911921 by 28 
The aim is to understand the frequency of 28 in 911921.

Let's proceed to step 1:
28 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 28

Going ahead to step 2:
28 can be fit into 91 3 times, resulting in a remainder of 7.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 84 from 91 to get 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 28

Step 3:
28 goes into 71 2 times with a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 32.0
The remainder is 15 after subtracting 56 from 71.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 28

Let's proceed to step 4:
28 goes into 159 5 times with a remainder of 19.
Record the quotient 5 as the next digit in the result. 
Result so far: 325.0
The remainder is 19 after subtracting 140 from 159.
Include the next digit (2) from the dividend after 19, then repeat: 192 / 28

Let's proceed to step 5:
The number 28 fits into 192 6 times, leaving a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 3256.0
Deduct 168 from 192 and we're left with 24.
Include the next digit (1) from the dividend after 24, then repeat: 241 / 28

Advancing to step 6:
241 divided by 28 is 8 with a remainder of 17.
Use 8 as the next digit of our solution. 
Result so far: 32568.0
If we take 224 away from 241, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 7:
28 can be fit into 170 6 times, resulting in a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 32568.6
If we take 168 away from 170, 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.

On to step 8:
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: 32568.6
Subtracting 0 from 20 leaves us 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.

On to step 9:
200 divided by 28 is 7 with a remainder of 4.
The next digit of our result is 7. 
Result so far: 32568.607
Subtracting 196 from 200 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
If we divide 40 by 28, we get 1 and a remainder of 12.
The next digit of our result is 1. 
Result so far: 32568.6071
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.

Step 11:
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: 32568.60714
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.

Let's proceed to step 12:
28 goes into 80 2 times with a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 32568.607142
Subtracting 56 from 80 leaves us with 24.
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 13:
240 divided by 28 is 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 32568.6071428
Subtract 224 from 240 to 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.

Moving on to step 14:
28 can be fit into 160 5 times, resulting in a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 32568.60714285
If we subtract 140 from 160, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 32568.60714285, with a leftover of 2e-08.