Let's divide 66211530 by 815
The aim is to understand the frequency of 815 in 66211530.

Moving on to step 1:
If we divide 6 by 815, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 815

Going ahead to step 2:
66 divided by 815 is 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Append the next digit (2) from the dividend to 66 and continue with: 662 / 815

Step 3:
815 goes into 662 0 times with a remainder of 662.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 662 after subtracting 0 from 662.
Fetch the next digit (1) from the dividend, attach it to 662 and continue: 6621 / 815

Going ahead to step 4:
If we divide 6621 by 815, we get 8 and a remainder of 101.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 6520 from 6621 to get 101.
Append the next digit (1) from the dividend to 101 and continue with: 1011 / 815

On to step 5:
1011 divided by 815 is 1 with a remainder of 196.
The number 1 becomes the next digit in our result. 
Result so far: 81.0
Deduct 815 from 1011 and we're left with 196.
Take the next digit (5) from the dividend and append it to 196, then repeat: 1965 / 815

Going ahead to step 6:
815 can be fit into 1965 2 times, resulting in a remainder of 335.
The number 2 becomes the next digit in our result. 
Result so far: 812.0
Subtracting 1630 from 1965 leaves us with 335.
Take the next digit (3) from the dividend and append it to 335, then repeat: 3353 / 815

Moving on to step 7:
When dividing 3353 by 815, we get 4 with a remainder of 93.
Put 4 as the next digit of the answer. 
Result so far: 8124.0
Subtract 3260 from 3353 to get 93.
Append the next digit (0) from the dividend to 93 and continue with: 930 / 815

Going ahead to step 8:
If we divide 930 by 815, we get 1 and a remainder of 115.
Put 1 as the next digit of the answer. 
Result so far: 81241.0
If we take 815 away from 930, we end up with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

On to step 9:
815 goes into 1150 1 times with a remainder of 335.
Put 1 as the next digit of the answer. 
Result so far: 81241.1
Subtracting 815 from 1150 leaves us with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Going ahead to step 10:
3350 divided by 815 is 4 with a remainder of 90.
Use 4 as the next digit of our solution. 
Result so far: 81241.14
Subtract 3260 from 3350 to get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 11:
When dividing 900 by 815, we get 1 with a remainder of 85.
Put 1 as the next digit of the answer. 
Result so far: 81241.141
If we take 815 away from 900, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Going ahead to step 12:
815 goes into 850 1 times with a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 81241.1411
If we take 815 away from 850, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Our division results in 81241.1411 with a remaining 0.00035.