We're dividing 28710521 by 668 
The aim is to understand the frequency of 668 in 28710521.

Step 1:
2 divided by 668 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 668

On to step 2:
When dividing 28 by 668, we get 0 with a remainder of 28.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 28 to get 28.
Fetch the next digit (7) from the dividend, attach it to 28 and continue: 287 / 668

Going ahead to step 3:
287 divided by 668 is 0 with a remainder of 287.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 287, we end up with 287.
Grab the next digit (1) from the dividend, add it to 287, then carry on: 2871 / 668

Moving on to step 4:
The number 668 fits into 2871 4 times, leaving a remainder of 199.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 2672 from 2871 leaves us with 199.
Include the next digit (0) from the dividend after 199, then repeat: 1990 / 668

Moving on to step 5:
1990 divided by 668 is 2 with a remainder of 654.
Write down 2 as next digit of the result. 
Result so far: 42.0
Deduct 1336 from 1990 and we're left with 654.
Grab the next digit (5) from the dividend, add it to 654, then carry on: 6545 / 668

Let's proceed to step 6:
668 can be fit into 6545 9 times, resulting in a remainder of 533.
Use 9 as the next digit of our solution. 
Result so far: 429.0
Subtracting 6012 from 6545 leaves us with 533.
Include the next digit (2) from the dividend after 533, then repeat: 5332 / 668

Going ahead to step 7:
668 goes into 5332 7 times with a remainder of 656.
Use 7 as the next digit of our solution. 
Result so far: 4297.0
Deduct 4676 from 5332 and we're left with 656.
Append the next digit (1) from the dividend to 656 and continue with: 6561 / 668

Let's proceed to step 8:
668 can be fit into 6561 9 times, resulting in a remainder of 549.
Record the quotient 9 as the next digit in the result. 
Result so far: 42979.0
If we subtract 6012 from 6561, we get 549.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5490, and continue the process.

Let's proceed to step 9:
5490 divided by 668 is 8 with a remainder of 146.
Use 8 as the next digit of our solution. 
Result so far: 42979.8
If we take 5344 away from 5490, we end up with 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Step 10:
1460 divided by 668 is 2 with a remainder of 124.
Put 2 as the next digit of the answer. 
Result so far: 42979.82
If we take 1336 away from 1460, we end up with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 11:
668 can be fit into 1240 1 times, resulting in a remainder of 572.
Record the quotient 1 as the next digit in the result. 
Result so far: 42979.821
The remainder is 572 after subtracting 668 from 1240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Let's proceed to step 12:
If we divide 5720 by 668, we get 8 and a remainder of 376.
Use 8 as the next digit of our solution. 
Result so far: 42979.8218
Subtract 5344 from 5720 to get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Step 13:
When dividing 3760 by 668, we get 5 with a remainder of 420.
Record the quotient 5 as the next digit in the result. 
Result so far: 42979.82185
Deduct 3340 from 3760 and we're left with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

On to step 14:
The number 668 fits into 4200 6 times, leaving a remainder of 192.
The number 6 becomes the next digit in our result. 
Result so far: 42979.821856
Subtracting 4008 from 4200 leaves us with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Let's proceed to step 15:
The number 668 fits into 1920 2 times, leaving a remainder of 584.
Write down 2 as next digit of the result. 
Result so far: 42979.8218562
The remainder is 584 after subtracting 1336 from 1920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

Moving on to step 16:
If we divide 5840 by 668, we get 8 and a remainder of 496.
Write down 8 as next digit of the result. 
Result so far: 42979.82185628
The remainder is 496 after subtracting 5344 from 5840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

In conclusion, the division gives 42979.82185628 with a balance of 4.96e-07.