519567 ÷ 66 
The aim is to understand the frequency of 66 in 519567.

Going ahead to step 1:
If we divide 5 by 66, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 66

Step 2:
51 divided by 66 is 0 with a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Append the next digit (9) from the dividend to 51 and continue with: 519 / 66

Going ahead to step 3:
When dividing 519 by 66, we get 7 with a remainder of 57.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we subtract 462 from 519, we get 57.
Include the next digit (5) from the dividend after 57, then repeat: 575 / 66

Step 4:
If we divide 575 by 66, we get 8 and a remainder of 47.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
If we subtract 528 from 575, we get 47.
Grab the next digit (6) from the dividend, add it to 47, then carry on: 476 / 66

Step 5:
When dividing 476 by 66, we get 7 with a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 787.0
Subtracting 462 from 476 leaves us with 14.
Append the next digit (7) from the dividend to 14 and continue with: 147 / 66

Step 6:
When dividing 147 by 66, we get 2 with a remainder of 15.
The number 2 becomes the next digit in our result. 
Result so far: 7872.0
Subtracting 132 from 147 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
The number 66 fits into 150 2 times, leaving a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 7872.2
The remainder is 18 after subtracting 132 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 8:
180 divided by 66 is 2 with a remainder of 48.
The next digit of our result is 2. 
Result so far: 7872.22
The remainder is 48 after subtracting 132 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The final outcome is 7872.22, with a leftover of 0.048.