We look at the division of 52127449 by 660 
The aim is to understand the frequency of 660 in 52127449.

Let's proceed to step 1:
660 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 660

On to step 2:
When dividing 52 by 660, we get 0 with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 52 and we're left with 52.
Grab the next digit (1) from the dividend, add it to 52, then carry on: 521 / 660

On to step 3:
If we divide 521 by 660, we get 0 and a remainder of 521.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 521 leaves us with 521.
Include the next digit (2) from the dividend after 521, then repeat: 5212 / 660

Step 4:
The number 660 fits into 5212 7 times, leaving a remainder of 592.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 4620 from 5212 leaves us with 592.
Fetch the next digit (7) from the dividend, attach it to 592 and continue: 5927 / 660

On to step 5:
If we divide 5927 by 660, we get 8 and a remainder of 647.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
Subtract 5280 from 5927 to get 647.
Grab the next digit (4) from the dividend, add it to 647, then carry on: 6474 / 660

Let's proceed to step 6:
660 can be fit into 6474 9 times, resulting in a remainder of 534.
Record the quotient 9 as the next digit in the result. 
Result so far: 789.0
If we take 5940 away from 6474, we end up with 534.
Take the next digit (4) from the dividend and append it to 534, then repeat: 5344 / 660

Let's proceed to step 7:
When dividing 5344 by 660, we get 8 with a remainder of 64.
The next digit of our result is 8. 
Result so far: 7898.0
Subtracting 5280 from 5344 leaves us with 64.
Append the next digit (9) from the dividend to 64 and continue with: 649 / 660

Moving on to step 8:
When dividing 649 by 660, we get 0 with a remainder of 649.
Use 0 as the next digit of our solution. 
Result so far: 78980.0
The remainder is 649 after subtracting 0 from 649.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6490, and continue the process.

Advancing to step 9:
6490 divided by 660 is 9 with a remainder of 550.
The number 9 becomes the next digit in our result. 
Result so far: 78980.9
Deduct 5940 from 6490 and we're left with 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Advancing to step 10:
When dividing 5500 by 660, we get 8 with a remainder of 220.
Use 8 as the next digit of our solution. 
Result so far: 78980.98
Subtract 5280 from 5500 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

On to step 11:
660 goes into 2200 3 times with a remainder of 220.
Use 3 as the next digit of our solution. 
Result so far: 78980.983
Subtract 1980 from 2200 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 12:
When dividing 2200 by 660, we get 3 with a remainder of 220.
The number 3 becomes the next digit in our result. 
Result so far: 78980.9833
Subtract 1980 from 2200 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

The final outcome is 78980.9833, with a leftover of 0.0022.