Let's divide 639933 by 28
The aim is to understand the frequency of 28 in 639933.

Moving on to step 1:
When dividing 6 by 28, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 28

On to step 2:
28 goes into 63 2 times with a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 56 from 63 to get 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 28

Advancing to step 3:
When dividing 79 by 28, we get 2 with a remainder of 23.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
If we take 56 away from 79, we end up with 23.
Grab the next digit (9) from the dividend, add it to 23, then carry on: 239 / 28

Going ahead to step 4:
The number 28 fits into 239 8 times, leaving a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 228.0
Subtract 224 from 239 to get 15.
Append the next digit (3) from the dividend to 15 and continue with: 153 / 28

On to step 5:
The number 28 fits into 153 5 times, leaving a remainder of 13.
Put 5 as the next digit of the answer. 
Result so far: 2285.0
Subtracting 140 from 153 leaves us with 13.
Bring next digit (3) of the dividend behind the 13 and repeat the process: 133 / 28

Let's proceed to step 6:
The number 28 fits into 133 4 times, leaving a remainder of 21.
Record the quotient 4 as the next digit in the result. 
Result so far: 22854.0
Subtracting 112 from 133 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 7:
210 divided by 28 is 7 with a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 22854.7
The remainder is 14 after subtracting 196 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
The number 28 fits into 140 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 22854.75
If we take 140 away from 140, we end up 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.

Moving on to step 9:
0 divided by 28 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 22854.75
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.

Advancing to step 10:
0 divided by 28 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 22854.75
Deduct 0 from 0 and we're left 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 22854.75, with a leftover of 0.0.