We look at the division of 165403 by 66 
The aim is to understand the frequency of 66 in 165403.

Let's proceed to step 1:
66 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 66

Moving on to step 2:
If we divide 16 by 66, we get 0 and a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 16, we end up with 16.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 66

Step 3:
The number 66 fits into 165 2 times, leaving a remainder of 33.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 33 after subtracting 132 from 165.
Grab the next digit (4) from the dividend, add it to 33, then carry on: 334 / 66

Advancing to step 4:
334 divided by 66 is 5 with a remainder of 4.
The next digit of our result is 5. 
Result so far: 25.0
Subtract 330 from 334 to get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 66

Let's proceed to step 5:
The number 66 fits into 40 0 times, leaving a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 250.0
If we subtract 0 from 40, we get 40.
Bring next digit (3) of the dividend behind the 40 and repeat the process: 403 / 66

Let's proceed to step 6:
When dividing 403 by 66, we get 6 with a remainder of 7.
The number 6 becomes the next digit in our result. 
Result so far: 2506.0
Deduct 396 from 403 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 7:
70 divided by 66 is 1 with a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 2506.1
Subtract 66 from 70 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 8:
40 divided by 66 is 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 2506.1
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 9:
The number 66 fits into 400 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 2506.106
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 10:
66 can be fit into 40 0 times, resulting in a remainder of 40.
The next digit of our result is 0. 
Result so far: 2506.106
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 11:
66 can be fit into 400 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 2506.10606
Deduct 396 from 400 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
66 goes into 40 0 times with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 2506.10606
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 13:
If we divide 400 by 66, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 2506.1060606
The remainder is 4 after subtracting 396 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 14:
The number 66 fits into 40 0 times, leaving a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 2506.1060606
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final result is 2506.1060606 with a remainder of 4e-08.