Let's divide 812123 by 28
The aim is to understand the frequency of 28 in 812123.

Advancing to step 1:
The number 28 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 28

Let's proceed to step 2:
The number 28 fits into 81 2 times, leaving a remainder of 25.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 56 from 81 to get 25.
Fetch the next digit (2) from the dividend, attach it to 25 and continue: 252 / 28

Going ahead to step 3:
28 goes into 252 9 times with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 29.0
If we subtract 252 from 252, we get 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 28

On to step 4:
28 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 290.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 28

Advancing to step 5:
28 goes into 12 0 times with a remainder of 12.
The next digit of our result is 0. 
Result so far: 2900.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 28

Advancing to step 6:
If we divide 123 by 28, we get 4 and a remainder of 11.
The next digit of our result is 4. 
Result so far: 29004.0
Subtracting 112 from 123 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
28 goes into 110 3 times with a remainder of 26.
Use 3 as the next digit of our solution. 
Result so far: 29004.3
Deduct 84 from 110 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 8:
When dividing 260 by 28, we get 9 with a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 29004.39
If we take 252 away from 260, we end up 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 9:
80 divided by 28 is 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 29004.392
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.

On to step 10:
If we divide 240 by 28, we get 8 and a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 29004.3928
If we take 224 away from 240, we end up 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.

Going ahead to step 11:
28 can be fit into 160 5 times, resulting in a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 29004.39285
Deduct 140 from 160 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.

Moving on to step 12:
The number 28 fits into 200 7 times, leaving a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 29004.392857
Subtract 196 from 200 to 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.

Going ahead to step 13:
28 goes into 40 1 times with a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 29004.3928571
The remainder is 12 after subtracting 28 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 14:
28 goes into 120 4 times with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 29004.39285714
The remainder is 8 after subtracting 112 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 29004.39285714 with a remainder of 8e-09.