399048 ÷ 66 
The aim is to understand the frequency of 66 in 399048.

Let's proceed to step 1:
When dividing 3 by 66, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 66

Moving on to step 2:
39 divided by 66 is 0 with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Include the next digit (9) from the dividend after 39, then repeat: 399 / 66

Advancing to step 3:
When dividing 399 by 66, we get 6 with a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtract 396 from 399 to get 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 66

On to step 4:
When dividing 30 by 66, we get 0 with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 60.0
If we subtract 0 from 30, we get 30.
Append the next digit (4) from the dividend to 30 and continue with: 304 / 66

Step 5:
When dividing 304 by 66, we get 4 with a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 604.0
Deduct 264 from 304 and we're left with 40.
Grab the next digit (8) from the dividend, add it to 40, then carry on: 408 / 66

Advancing to step 6:
66 can be fit into 408 6 times, resulting in a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 6046.0
Subtract 396 from 408 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 7:
66 goes into 120 1 times with a remainder of 54.
Put 1 as the next digit of the answer. 
Result so far: 6046.1
The remainder is 54 after subtracting 66 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 8:
The number 66 fits into 540 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 6046.18
Subtract 528 from 540 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
If we divide 120 by 66, we get 1 and a remainder of 54.
Record the quotient 1 as the next digit in the result. 
Result so far: 6046.181
If we take 66 away from 120, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 10:
When dividing 540 by 66, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 6046.1818
Deduct 528 from 540 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 11:
66 goes into 120 1 times with a remainder of 54.
The number 1 becomes the next digit in our result. 
Result so far: 6046.18181
Subtracting 66 from 120 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 12:
The number 66 fits into 540 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 6046.181818
If we take 528 away from 540, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
If we divide 120 by 66, we get 1 and a remainder of 54.
Record the quotient 1 as the next digit in the result. 
Result so far: 6046.1818181
If we subtract 66 from 120, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 14:
When dividing 540 by 66, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 6046.18181818
Deduct 528 from 540 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 6046.18181818 with a remainder of 1.2e-08.