Let's divide 255500 by 21
The aim is to understand the frequency of 21 in 255500.

Let's proceed to step 1:
2 divided by 21 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 21

Advancing to step 2:
The number 21 fits into 25 1 times, leaving a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 21 from 25, we get 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 21

Let's proceed to step 3:
If we divide 45 by 21, we get 2 and a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 42 from 45 and we're left with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 21

Going ahead to step 4:
If we divide 35 by 21, we get 1 and a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 121.0
The remainder is 14 after subtracting 21 from 35.
Fetch the next digit (0) from the dividend, attach it to 14 and continue: 140 / 21

Let's proceed to step 5:
140 divided by 21 is 6 with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 1216.0
Deduct 126 from 140 and we're left with 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 21

Going ahead to step 6:
21 goes into 140 6 times with a remainder of 14.
The next digit of our result is 6. 
Result so far: 12166.0
Deduct 126 from 140 and we're left 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.

On to step 7:
When dividing 140 by 21, we get 6 with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 12166.6
Deduct 126 from 140 and we're left 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.

Step 8:
21 can be fit into 140 6 times, resulting in a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 12166.66
Subtract 126 from 140 to 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.

In conclusion, the division gives 12166.66 with a balance of 0.014.