We're dividing 28495624 by 503 
The aim is to understand the frequency of 503 in 28495624.

On to step 1:
503 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 503

Advancing to step 2:
28 divided by 503 is 0 with a remainder of 28.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 28 to get 28.
Include the next digit (4) from the dividend after 28, then repeat: 284 / 503

On to step 3:
When dividing 284 by 503, we get 0 with a remainder of 284.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 284, we end up with 284.
Take the next digit (9) from the dividend and append it to 284, then repeat: 2849 / 503

Let's proceed to step 4:
The number 503 fits into 2849 5 times, leaving a remainder of 334.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we subtract 2515 from 2849, we get 334.
Append the next digit (5) from the dividend to 334 and continue with: 3345 / 503

On to step 5:
When dividing 3345 by 503, we get 6 with a remainder of 327.
Write down 6 as next digit of the result. 
Result so far: 56.0
Subtracting 3018 from 3345 leaves us with 327.
Grab the next digit (6) from the dividend, add it to 327, then carry on: 3276 / 503

Advancing to step 6:
The number 503 fits into 3276 6 times, leaving a remainder of 258.
Record the quotient 6 as the next digit in the result. 
Result so far: 566.0
If we subtract 3018 from 3276, we get 258.
Bring next digit (2) of the dividend behind the 258 and repeat the process: 2582 / 503

On to step 7:
503 goes into 2582 5 times with a remainder of 67.
The next digit of our result is 5. 
Result so far: 5665.0
Subtracting 2515 from 2582 leaves us with 67.
Bring next digit (4) of the dividend behind the 67 and repeat the process: 674 / 503

Advancing to step 8:
503 can be fit into 674 1 times, resulting in a remainder of 171.
Write down 1 as next digit of the result. 
Result so far: 56651.0
Deduct 503 from 674 and we're left with 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Advancing to step 9:
1710 divided by 503 is 3 with a remainder of 201.
Write down 3 as next digit of the result. 
Result so far: 56651.3
If we subtract 1509 from 1710, we get 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Step 10:
When dividing 2010 by 503, we get 3 with a remainder of 501.
Put 3 as the next digit of the answer. 
Result so far: 56651.33
If we take 1509 away from 2010, we end up with 501.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5010, and continue the process.

After the division, we end up with 56651.33 and a remainder of 0.501.