We look at the division of 420712 by 28 
The aim is to understand the frequency of 28 in 420712.

Going ahead to step 1:
If we divide 4 by 28, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 28

Step 2:
The number 28 fits into 42 1 times, leaving a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 28 away from 42, we end up with 14.
Bring next digit (0) of the dividend behind the 14 and repeat the process: 140 / 28

On to step 3:
28 goes into 140 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtract 140 from 140 to get 0.
Append the next digit (7) from the dividend to 0 and continue with: 7 / 28

On to step 4:
28 can be fit into 7 0 times, resulting in a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 150.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 28

Step 5:
The number 28 fits into 71 2 times, leaving a remainder of 15.
Write down 2 as next digit of the result. 
Result so far: 1502.0
Deduct 56 from 71 and we're left with 15.
Grab the next digit (2) from the dividend, add it to 15, then carry on: 152 / 28

Going ahead to step 6:
The number 28 fits into 152 5 times, leaving a remainder of 12.
Put 5 as the next digit of the answer. 
Result so far: 15025.0
If we subtract 140 from 152, we 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.

Let's proceed to step 7:
When dividing 120 by 28, we get 4 with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 15025.4
If we subtract 112 from 120, we 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.

Step 8:
28 can be fit into 80 2 times, resulting in a remainder of 24.
The next digit of our result is 2. 
Result so far: 15025.42
Subtract 56 from 80 to 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 9:
When dividing 240 by 28, we get 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 15025.428
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.

Let's proceed to step 10:
160 divided by 28 is 5 with a remainder of 20.
The next digit of our result is 5. 
Result so far: 15025.4285
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.

Advancing to step 11:
The number 28 fits into 200 7 times, leaving a remainder of 4.
The next digit of our result is 7. 
Result so far: 15025.42857
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.

Step 12:
40 divided by 28 is 1 with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 15025.428571
Deduct 28 from 40 and we're left 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.

Let's proceed to step 13:
If we divide 120 by 28, we get 4 and a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 15025.4285714
If we take 112 away from 120, 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.

On to step 14:
28 goes into 80 2 times with a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 15025.42857142
Deduct 56 from 80 and we're left 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.

After the division, we end up with 15025.42857142 and a remainder of 2.4e-08.