We're dividing 28138343 by 686 
The aim is to understand the frequency of 686 in 28138343.

Moving on to step 1:
When dividing 2 by 686, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 686

Let's proceed to step 2:
When dividing 28 by 686, we get 0 with a remainder of 28.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 28, we end up with 28.
Bring next digit (1) of the dividend behind the 28 and repeat the process: 281 / 686

Let's proceed to step 3:
If we divide 281 by 686, we get 0 and a remainder of 281.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 281 leaves us with 281.
Append the next digit (3) from the dividend to 281 and continue with: 2813 / 686

Moving on to step 4:
2813 divided by 686 is 4 with a remainder of 69.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 2744 from 2813 to get 69.
Take the next digit (8) from the dividend and append it to 69, then repeat: 698 / 686

Going ahead to step 5:
The number 686 fits into 698 1 times, leaving a remainder of 12.
The next digit of our result is 1. 
Result so far: 41.0
The remainder is 12 after subtracting 686 from 698.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 686

Moving on to step 6:
686 can be fit into 123 0 times, resulting in a remainder of 123.
Write down 0 as next digit of the result. 
Result so far: 410.0
If we subtract 0 from 123, we get 123.
Append the next digit (4) from the dividend to 123 and continue with: 1234 / 686

Moving on to step 7:
When dividing 1234 by 686, we get 1 with a remainder of 548.
The next digit of our result is 1. 
Result so far: 4101.0
Subtract 686 from 1234 to get 548.
Take the next digit (3) from the dividend and append it to 548, then repeat: 5483 / 686

Let's proceed to step 8:
686 goes into 5483 7 times with a remainder of 681.
Record the quotient 7 as the next digit in the result. 
Result so far: 41017.0
Subtract 4802 from 5483 to get 681.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6810, and continue the process.

On to step 9:
When dividing 6810 by 686, we get 9 with a remainder of 636.
Write down 9 as next digit of the result. 
Result so far: 41017.9
The remainder is 636 after subtracting 6174 from 6810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Step 10:
6360 divided by 686 is 9 with a remainder of 186.
Use 9 as the next digit of our solution. 
Result so far: 41017.99
Subtracting 6174 from 6360 leaves us with 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

After the division, we end up with 41017.99 and a remainder of 0.186.