423486 divided by 28 
The aim is to understand the frequency of 28 in 423486.

Advancing to step 1:
28 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 28

On to step 2:
42 divided by 28 is 1 with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 28 from 42 leaves us with 14.
Append the next digit (3) from the dividend to 14 and continue with: 143 / 28

Let's proceed to step 3:
28 goes into 143 5 times with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 15.0
If we subtract 140 from 143, we get 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 28

Let's proceed to step 4:
28 goes into 34 1 times with a remainder of 6.
The next digit of our result is 1. 
Result so far: 151.0
If we subtract 28 from 34, we get 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 28

Moving on to step 5:
28 goes into 68 2 times with a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 1512.0
If we take 56 away from 68, we end up with 12.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 28

Let's proceed to step 6:
The number 28 fits into 126 4 times, leaving a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 15124.0
Subtracting 112 from 126 leaves us with 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 7:
28 can be fit into 140 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 15124.5
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 8:
The number 28 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 15124.5
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.

Going ahead to step 9:
0 divided by 28 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 15124.5
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 outcome is 15124.5, with a leftover of 0.0.