We look at the division of 66215993 by 204 
The aim is to understand the frequency of 204 in 66215993.

Step 1:
204 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 204

Going ahead to step 2:
When dividing 66 by 204, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Append the next digit (2) from the dividend to 66 and continue with: 662 / 204

Advancing to step 3:
If we divide 662 by 204, we get 3 and a remainder of 50.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 612 from 662 and we're left with 50.
Bring next digit (1) of the dividend behind the 50 and repeat the process: 501 / 204

Step 4:
If we divide 501 by 204, we get 2 and a remainder of 93.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
If we take 408 away from 501, we end up with 93.
Grab the next digit (5) from the dividend, add it to 93, then carry on: 935 / 204

On to step 5:
When dividing 935 by 204, we get 4 with a remainder of 119.
Record the quotient 4 as the next digit in the result. 
Result so far: 324.0
If we take 816 away from 935, we end up with 119.
Append the next digit (9) from the dividend to 119 and continue with: 1199 / 204

Step 6:
If we divide 1199 by 204, we get 5 and a remainder of 179.
The number 5 becomes the next digit in our result. 
Result so far: 3245.0
Deduct 1020 from 1199 and we're left with 179.
Fetch the next digit (9) from the dividend, attach it to 179 and continue: 1799 / 204

Step 7:
204 goes into 1799 8 times with a remainder of 167.
Put 8 as the next digit of the answer. 
Result so far: 32458.0
Deduct 1632 from 1799 and we're left with 167.
Include the next digit (3) from the dividend after 167, then repeat: 1673 / 204

Step 8:
1673 divided by 204 is 8 with a remainder of 41.
Record the quotient 8 as the next digit in the result. 
Result so far: 324588.0
Subtracting 1632 from 1673 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 9:
When dividing 410 by 204, we get 2 with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 324588.2
If we subtract 408 from 410, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 10:
If we divide 20 by 204, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 324588.2
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 11:
When dividing 200 by 204, we get 0 with a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 324588.2
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

In conclusion, the division gives 324588.2 with a balance of 0.02.