We're dividing 48600503 by 621 
The aim is to understand the frequency of 621 in 48600503.

Step 1:
When dividing 4 by 621, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 621

On to step 2:
621 goes into 48 0 times with a remainder of 48.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 48 to get 48.
Append the next digit (6) from the dividend to 48 and continue with: 486 / 621

On to step 3:
621 can be fit into 486 0 times, resulting in a remainder of 486.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 486 leaves us with 486.
Take the next digit (0) from the dividend and append it to 486, then repeat: 4860 / 621

Moving on to step 4:
If we divide 4860 by 621, we get 7 and a remainder of 513.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we subtract 4347 from 4860, we get 513.
Bring next digit (0) of the dividend behind the 513 and repeat the process: 5130 / 621

Moving on to step 5:
When dividing 5130 by 621, we get 8 with a remainder of 162.
The next digit of our result is 8. 
Result so far: 78.0
If we take 4968 away from 5130, we end up with 162.
Include the next digit (5) from the dividend after 162, then repeat: 1625 / 621

Let's proceed to step 6:
When dividing 1625 by 621, we get 2 with a remainder of 383.
Use 2 as the next digit of our solution. 
Result so far: 782.0
Deduct 1242 from 1625 and we're left with 383.
Bring next digit (0) of the dividend behind the 383 and repeat the process: 3830 / 621

Step 7:
When dividing 3830 by 621, we get 6 with a remainder of 104.
Record the quotient 6 as the next digit in the result. 
Result so far: 7826.0
If we take 3726 away from 3830, we end up with 104.
Bring next digit (3) of the dividend behind the 104 and repeat the process: 1043 / 621

On to step 8:
621 goes into 1043 1 times with a remainder of 422.
Write down 1 as next digit of the result. 
Result so far: 78261.0
The remainder is 422 after subtracting 621 from 1043.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Let's proceed to step 9:
When dividing 4220 by 621, we get 6 with a remainder of 494.
The number 6 becomes the next digit in our result. 
Result so far: 78261.6
If we take 3726 away from 4220, we end up with 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

Moving on to step 10:
The number 621 fits into 4940 7 times, leaving a remainder of 593.
The number 7 becomes the next digit in our result. 
Result so far: 78261.67
If we take 4347 away from 4940, we end up with 593.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5930, and continue the process.

Let's proceed to step 11:
If we divide 5930 by 621, we get 9 and a remainder of 341.
The number 9 becomes the next digit in our result. 
Result so far: 78261.679
Deduct 5589 from 5930 and we're left with 341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Moving on to step 12:
621 goes into 3410 5 times with a remainder of 305.
Record the quotient 5 as the next digit in the result. 
Result so far: 78261.6795
If we subtract 3105 from 3410, we get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Step 13:
621 goes into 3050 4 times with a remainder of 566.
Write down 4 as next digit of the result. 
Result so far: 78261.67954
If we subtract 2484 from 3050, we get 566.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5660, and continue the process.

Advancing to step 14:
621 goes into 5660 9 times with a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 78261.679549
If we take 5589 away from 5660, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 15:
621 can be fit into 710 1 times, resulting in a remainder of 89.
The next digit of our result is 1. 
Result so far: 78261.6795491
The remainder is 89 after subtracting 621 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Going ahead to step 16:
The number 621 fits into 890 1 times, leaving a remainder of 269.
Write down 1 as next digit of the result. 
Result so far: 78261.67954911
Deduct 621 from 890 and we're left with 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

The final outcome is 78261.67954911, with a leftover of 2.69e-07.