We divide 568778 by 21
The aim is to understand the frequency of 21 in 568778.

Let's proceed to step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 21

On to step 2:
21 can be fit into 56 2 times, resulting in a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 14 after subtracting 42 from 56.
Include the next digit (8) from the dividend after 14, then repeat: 148 / 21

On to step 3:
148 divided by 21 is 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 27.0
Subtracting 147 from 148 leaves us with 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 21

Moving on to step 4:
When dividing 17 by 21, we get 0 with a remainder of 17.
The next digit of our result is 0. 
Result so far: 270.0
Subtracting 0 from 17 leaves us with 17.
Include the next digit (7) from the dividend after 17, then repeat: 177 / 21

Going ahead to step 5:
21 can be fit into 177 8 times, resulting in a remainder of 9.
Write down 8 as next digit of the result. 
Result so far: 2708.0
If we take 168 away from 177, we end up with 9.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 21

Going ahead to step 6:
98 divided by 21 is 4 with a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 27084.0
Subtract 84 from 98 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.

Advancing to step 7:
When dividing 140 by 21, we get 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 27084.6
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.

Going ahead to step 8:
The number 21 fits into 140 6 times, leaving a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 27084.66
Subtracting 126 from 140 leaves us 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.

The final result is 27084.66 with a remainder of 0.014.