Let's divide 50556800 by 21
The aim is to understand the frequency of 21 in 50556800.

Step 1:
5 divided by 21 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (0) from the dividend after 5, then repeat: 50 / 21

On to step 2:
21 goes into 50 2 times with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 42 away from 50, we end up with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 21

Let's proceed to step 3:
The number 21 fits into 85 4 times, leaving a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Subtract 84 from 85 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 21

Step 4:
21 can be fit into 15 0 times, resulting in a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 240.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 21

Moving on to step 5:
156 divided by 21 is 7 with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 2407.0
The remainder is 9 after subtracting 147 from 156.
Fetch the next digit (8) from the dividend, attach it to 9 and continue: 98 / 21

Advancing to step 6:
98 divided by 21 is 4 with a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 24074.0
Subtracting 84 from 98 leaves us with 14.
Include the next digit (0) from the dividend after 14, then repeat: 140 / 21

Moving on to step 7:
If we divide 140 by 21, we get 6 and a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 240746.0
If we subtract 126 from 140, we get 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 21

Going ahead to step 8:
140 divided by 21 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 2407466.0
If we subtract 126 from 140, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 9:
21 goes into 140 6 times with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 2407466.6
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 10:
If we divide 140 by 21, we get 6 and a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 2407466.66
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

After the division, we end up with 2407466.66 and a remainder of 0.014.