We look at the division of 423538 by 28 
The aim is to understand the frequency of 28 in 423538.

Going ahead to step 1:
If we divide 4 by 28, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 28

Step 2:
When dividing 42 by 28, we get 1 with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 28 from 42 and we're left with 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 28

Let's proceed to step 3:
28 goes into 143 5 times with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we subtract 140 from 143, we get 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 28

Moving on to step 4:
The number 28 fits into 35 1 times, leaving a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 151.0
Subtract 28 from 35 to get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 28

Let's proceed to step 5:
When dividing 73 by 28, we get 2 with a remainder of 17.
Write down 2 as next digit of the result. 
Result so far: 1512.0
If we subtract 56 from 73, we get 17.
Bring next digit (8) of the dividend behind the 17 and repeat the process: 178 / 28

Advancing to step 6:
If we divide 178 by 28, we get 6 and a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 15126.0
Subtract 168 from 178 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
The number 28 fits into 100 3 times, leaving a remainder of 16.
Write down 3 as next digit of the result. 
Result so far: 15126.3
Deduct 84 from 100 and we're left 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.

On to step 8:
160 divided by 28 is 5 with a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 15126.35
Subtracting 140 from 160 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.

Step 9:
If we divide 200 by 28, we get 7 and a remainder of 4.
The next digit of our result is 7. 
Result so far: 15126.357
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.

Step 10:
If we divide 40 by 28, we get 1 and a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 15126.3571
Subtracting 28 from 40 leaves us 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.

Moving on to step 11:
28 goes into 120 4 times with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 15126.35714
Subtract 112 from 120 to 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.

Advancing to step 12:
80 divided by 28 is 2 with a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 15126.357142
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.

Step 13:
28 can be fit into 240 8 times, resulting in a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 15126.3571428
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.

Going ahead to step 14:
If we divide 160 by 28, we get 5 and a remainder of 20.
The number 5 becomes the next digit in our result. 
Result so far: 15126.35714285
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.

After the division, we end up with 15126.35714285 and a remainder of 2e-08.