Let's divide 81608012 by 660
The aim is to understand the frequency of 660 in 81608012.

Advancing to step 1:
660 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 660

Advancing to step 2:
81 divided by 660 is 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Grab the next digit (6) from the dividend, add it to 81, then carry on: 816 / 660

Let's proceed to step 3:
660 goes into 816 1 times with a remainder of 156.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 660 from 816 leaves us with 156.
Grab the next digit (0) from the dividend, add it to 156, then carry on: 1560 / 660

Moving on to step 4:
1560 divided by 660 is 2 with a remainder of 240.
The next digit of our result is 2. 
Result so far: 12.0
Deduct 1320 from 1560 and we're left with 240.
Grab the next digit (8) from the dividend, add it to 240, then carry on: 2408 / 660

Let's proceed to step 5:
660 goes into 2408 3 times with a remainder of 428.
Write down 3 as next digit of the result. 
Result so far: 123.0
If we subtract 1980 from 2408, we get 428.
Bring next digit (0) of the dividend behind the 428 and repeat the process: 4280 / 660

Moving on to step 6:
660 can be fit into 4280 6 times, resulting in a remainder of 320.
The number 6 becomes the next digit in our result. 
Result so far: 1236.0
If we take 3960 away from 4280, we end up with 320.
Append the next digit (1) from the dividend to 320 and continue with: 3201 / 660

Let's proceed to step 7:
If we divide 3201 by 660, we get 4 and a remainder of 561.
Use 4 as the next digit of our solution. 
Result so far: 12364.0
If we subtract 2640 from 3201, we get 561.
Append the next digit (2) from the dividend to 561 and continue with: 5612 / 660

Moving on to step 8:
660 can be fit into 5612 8 times, resulting in a remainder of 332.
Write down 8 as next digit of the result. 
Result so far: 123648.0
If we subtract 5280 from 5612, we get 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Moving on to step 9:
3320 divided by 660 is 5 with a remainder of 20.
The number 5 becomes the next digit in our result. 
Result so far: 123648.5
If we take 3300 away from 3320, we end up 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.

Advancing to step 10:
If we divide 200 by 660, we get 0 and a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 123648.5
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.

Moving on to step 11:
The number 660 fits into 2000 3 times, leaving a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 123648.503
The remainder is 20 after subtracting 1980 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 12:
660 can be fit into 200 0 times, resulting in a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 123648.503
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 13:
2000 divided by 660 is 3 with a remainder of 20.
Record the quotient 3 as the next digit in the result. 
Result so far: 123648.50303
The remainder is 20 after subtracting 1980 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 14:
When dividing 200 by 660, we get 0 with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 123648.50303
If we take 0 away from 200, we end up 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.

Advancing to step 15:
When dividing 2000 by 660, we get 3 with a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 123648.5030303
If we subtract 1980 from 2000, we get 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 16:
660 can be fit into 200 0 times, resulting in a remainder of 200.
The next digit of our result is 0. 
Result so far: 123648.5030303
Deduct 0 from 200 and we're left 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.

The final result is 123648.5030303 with a remainder of 2e-07.