21807 divided by 55 
The aim is to understand the frequency of 55 in 21807.

Let's proceed to step 1:
2 divided by 55 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 55

Going ahead to step 2:
21 divided by 55 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Take the next digit (8) from the dividend and append it to 21, then repeat: 218 / 55

On to step 3:
If we divide 218 by 55, we get 3 and a remainder of 53.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 165 from 218 to get 53.
Bring next digit (0) of the dividend behind the 53 and repeat the process: 530 / 55

On to step 4:
55 can be fit into 530 9 times, resulting in a remainder of 35.
Write down 9 as next digit of the result. 
Result so far: 39.0
The remainder is 35 after subtracting 495 from 530.
Grab the next digit (7) from the dividend, add it to 35, then carry on: 357 / 55

On to step 5:
If we divide 357 by 55, we get 6 and a remainder of 27.
Write down 6 as next digit of the result. 
Result so far: 396.0
The remainder is 27 after subtracting 330 from 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 6:
55 goes into 270 4 times with a remainder of 50.
Write down 4 as next digit of the result. 
Result so far: 396.4
If we take 220 away from 270, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 7:
If we divide 500 by 55, we get 9 and a remainder of 5.
Write down 9 as next digit of the result. 
Result so far: 396.49
If we take 495 away from 500, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 8:
If we divide 50 by 55, we get 0 and a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 396.49
Deduct 0 from 50 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
500 divided by 55 is 9 with a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 396.4909
If we take 495 away from 500, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 10:
50 divided by 55 is 0 with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 396.4909
Deduct 0 from 50 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 11:
If we divide 500 by 55, we get 9 and a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 396.490909
If we subtract 495 from 500, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 12:
55 can be fit into 50 0 times, resulting in a remainder of 50.
The next digit of our result is 0. 
Result so far: 396.490909
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 13:
The number 55 fits into 500 9 times, leaving a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 396.49090909
If we subtract 495 from 500, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 396.49090909, with a leftover of 5e-09.