We look at the division of 39964 by 28 
The aim is to understand the frequency of 28 in 39964.

Let's proceed to step 1:
If we divide 3 by 28, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 28

Going ahead to step 2:
The number 28 fits into 39 1 times, leaving a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 28 away from 39, we end up with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 28

Step 3:
The number 28 fits into 119 4 times, leaving a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 14.0
The remainder is 7 after subtracting 112 from 119.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 28

Step 4:
The number 28 fits into 76 2 times, leaving a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 142.0
If we take 56 away from 76, we end up with 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 28

Moving on to step 5:
The number 28 fits into 204 7 times, leaving a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 1427.0
Subtracting 196 from 204 leaves us 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.

Moving on to step 6:
If we divide 80 by 28, we get 2 and a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 1427.2
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.

Let's proceed to step 7:
When dividing 240 by 28, we get 8 with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 1427.28
If we subtract 224 from 240, we 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 8:
The number 28 fits into 160 5 times, leaving a remainder of 20.
The next digit of our result is 5. 
Result so far: 1427.285
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.

On to step 9:
If we divide 200 by 28, we get 7 and a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 1427.2857
The remainder is 4 after subtracting 196 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 10:
28 goes into 40 1 times with a remainder of 12.
The next digit of our result is 1. 
Result so far: 1427.28571
Subtract 28 from 40 to 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.

Step 11:
When dividing 120 by 28, we get 4 with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 1427.285714
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.

Going ahead to step 12:
28 goes into 80 2 times with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 1427.2857142
The remainder is 24 after subtracting 56 from 80.
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 13:
240 divided by 28 is 8 with a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 1427.28571428
If we subtract 224 from 240, we 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.

Our division results in 1427.28571428 with a remaining 1.6e-08.