66018312 divided by 872 
The aim is to understand the frequency of 872 in 66018312.

Step 1:
When dividing 6 by 872, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 872

Step 2:
66 divided by 872 is 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Grab the next digit (0) from the dividend, add it to 66, then carry on: 660 / 872

Advancing to step 3:
872 goes into 660 0 times with a remainder of 660.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 660 and we're left with 660.
Append the next digit (1) from the dividend to 660 and continue with: 6601 / 872

Step 4:
The number 872 fits into 6601 7 times, leaving a remainder of 497.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 497 after subtracting 6104 from 6601.
Bring next digit (8) of the dividend behind the 497 and repeat the process: 4978 / 872

On to step 5:
872 can be fit into 4978 5 times, resulting in a remainder of 618.
Write down 5 as next digit of the result. 
Result so far: 75.0
If we take 4360 away from 4978, we end up with 618.
Append the next digit (3) from the dividend to 618 and continue with: 6183 / 872

Advancing to step 6:
When dividing 6183 by 872, we get 7 with a remainder of 79.
Record the quotient 7 as the next digit in the result. 
Result so far: 757.0
If we subtract 6104 from 6183, we get 79.
Fetch the next digit (1) from the dividend, attach it to 79 and continue: 791 / 872

Going ahead to step 7:
872 can be fit into 791 0 times, resulting in a remainder of 791.
Write down 0 as next digit of the result. 
Result so far: 7570.0
Subtracting 0 from 791 leaves us with 791.
Take the next digit (2) from the dividend and append it to 791, then repeat: 7912 / 872

Advancing to step 8:
872 can be fit into 7912 9 times, resulting in a remainder of 64.
Put 9 as the next digit of the answer. 
Result so far: 75709.0
Subtract 7848 from 7912 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 9:
640 divided by 872 is 0 with a remainder of 640.
Use 0 as the next digit of our solution. 
Result so far: 75709.0
If we take 0 away from 640, we end up with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

On to step 10:
If we divide 6400 by 872, we get 7 and a remainder of 296.
The number 7 becomes the next digit in our result. 
Result so far: 75709.07
Subtracting 6104 from 6400 leaves us with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Advancing to step 11:
When dividing 2960 by 872, we get 3 with a remainder of 344.
The number 3 becomes the next digit in our result. 
Result so far: 75709.073
If we take 2616 away from 2960, we end up with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Let's proceed to step 12:
872 goes into 3440 3 times with a remainder of 824.
Use 3 as the next digit of our solution. 
Result so far: 75709.0733
Subtracting 2616 from 3440 leaves us with 824.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8240, and continue the process.

The final outcome is 75709.0733, with a leftover of 0.00824.