We're dividing 669340 by 66 
The aim is to understand the frequency of 66 in 669340.

Step 1:
66 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 66

Let's proceed to step 2:
66 can be fit into 66 1 times, resulting in a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 66 from 66 to get 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 66

Step 3:
66 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 9, we end up with 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 66

Going ahead to step 4:
When dividing 93 by 66, we get 1 with a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 101.0
If we subtract 66 from 93, we get 27.
Bring next digit (4) of the dividend behind the 27 and repeat the process: 274 / 66

On to step 5:
The number 66 fits into 274 4 times, leaving a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 1014.0
If we subtract 264 from 274, we get 10.
Fetch the next digit (0) from the dividend, attach it to 10 and continue: 100 / 66

On to step 6:
66 goes into 100 1 times with a remainder of 34.
Put 1 as the next digit of the answer. 
Result so far: 10141.0
If we take 66 away from 100, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 7:
66 goes into 340 5 times with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 10141.5
If we take 330 away from 340, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
The number 66 fits into 100 1 times, leaving a remainder of 34.
The next digit of our result is 1. 
Result so far: 10141.51
The remainder is 34 after subtracting 66 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 9:
The number 66 fits into 340 5 times, leaving a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 10141.515
Subtracting 330 from 340 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
If we divide 100 by 66, we get 1 and a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 10141.5151
The remainder is 34 after subtracting 66 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 11:
66 goes into 340 5 times with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 10141.51515
If we take 330 away from 340, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
The number 66 fits into 100 1 times, leaving a remainder of 34.
Record the quotient 1 as the next digit in the result. 
Result so far: 10141.515151
Deduct 66 from 100 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 13:
If we divide 340 by 66, we get 5 and a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 10141.5151515
Subtracting 330 from 340 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 14:
If we divide 100 by 66, we get 1 and a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 10141.51515151
Deduct 66 from 100 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

The final result is 10141.51515151 with a remainder of 3.4e-08.