We're dividing 21255093 by 579 
The aim is to understand the frequency of 579 in 21255093.

On to step 1:
When dividing 2 by 579, we get 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 579

On to step 2:
When dividing 21 by 579, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 579

Step 3:
The number 579 fits into 212 0 times, leaving a remainder of 212.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 212 and we're left with 212.
Include the next digit (5) from the dividend after 212, then repeat: 2125 / 579

Step 4:
When dividing 2125 by 579, we get 3 with a remainder of 388.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 1737 from 2125 to get 388.
Append the next digit (5) from the dividend to 388 and continue with: 3885 / 579

On to step 5:
The number 579 fits into 3885 6 times, leaving a remainder of 411.
Put 6 as the next digit of the answer. 
Result so far: 36.0
Subtract 3474 from 3885 to get 411.
Append the next digit (0) from the dividend to 411 and continue with: 4110 / 579

Going ahead to step 6:
579 can be fit into 4110 7 times, resulting in a remainder of 57.
The next digit of our result is 7. 
Result so far: 367.0
If we take 4053 away from 4110, we end up with 57.
Include the next digit (9) from the dividend after 57, then repeat: 579 / 579

Moving on to step 7:
579 goes into 579 1 times with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 3671.0
Subtracting 579 from 579 leaves us with 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 579

Going ahead to step 8:
The number 579 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 36710.0
If we subtract 0 from 3, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 9:
579 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 36710.0
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 10:
300 divided by 579 is 0 with a remainder of 300.
The next digit of our result is 0. 
Result so far: 36710.0
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

In conclusion, the division gives 36710.0 with a balance of 0.3.