28129351 ÷ 631 
The aim is to understand the frequency of 631 in 28129351.

On to step 1:
If we divide 2 by 631, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 631

Moving on to step 2:
28 divided by 631 is 0 with a remainder of 28.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 28 leaves us with 28.
Append the next digit (1) from the dividend to 28 and continue with: 281 / 631

Going ahead to step 3:
The number 631 fits into 281 0 times, leaving a remainder of 281.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 281 leaves us with 281.
Bring next digit (2) of the dividend behind the 281 and repeat the process: 2812 / 631

Going ahead to step 4:
The number 631 fits into 2812 4 times, leaving a remainder of 288.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 2524 from 2812 to get 288.
Include the next digit (9) from the dividend after 288, then repeat: 2889 / 631

On to step 5:
When dividing 2889 by 631, we get 4 with a remainder of 365.
The next digit of our result is 4. 
Result so far: 44.0
Subtracting 2524 from 2889 leaves us with 365.
Fetch the next digit (3) from the dividend, attach it to 365 and continue: 3653 / 631

Advancing to step 6:
If we divide 3653 by 631, we get 5 and a remainder of 498.
Record the quotient 5 as the next digit in the result. 
Result so far: 445.0
Subtract 3155 from 3653 to get 498.
Append the next digit (5) from the dividend to 498 and continue with: 4985 / 631

Advancing to step 7:
When dividing 4985 by 631, we get 7 with a remainder of 568.
Write down 7 as next digit of the result. 
Result so far: 4457.0
If we subtract 4417 from 4985, we get 568.
Include the next digit (1) from the dividend after 568, then repeat: 5681 / 631

Going ahead to step 8:
The number 631 fits into 5681 9 times, leaving a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 44579.0
If we take 5679 away from 5681, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 9:
20 divided by 631 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 44579.0
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 10:
200 divided by 631 is 0 with a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 44579.0
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final result is 44579.0 with a remainder of 0.2.