We look at the division of 523167 by 66 
The aim is to understand the frequency of 66 in 523167.

Step 1:
The number 66 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 66

On to step 2:
When dividing 52 by 66, we get 0 with a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 52 leaves us with 52.
Fetch the next digit (3) from the dividend, attach it to 52 and continue: 523 / 66

Moving on to step 3:
When dividing 523 by 66, we get 7 with a remainder of 61.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtract 462 from 523 to get 61.
Grab the next digit (1) from the dividend, add it to 61, then carry on: 611 / 66

On to step 4:
66 can be fit into 611 9 times, resulting in a remainder of 17.
The next digit of our result is 9. 
Result so far: 79.0
Subtract 594 from 611 to get 17.
Fetch the next digit (6) from the dividend, attach it to 17 and continue: 176 / 66

Let's proceed to step 5:
66 can be fit into 176 2 times, resulting in a remainder of 44.
The number 2 becomes the next digit in our result. 
Result so far: 792.0
If we take 132 away from 176, we end up with 44.
Grab the next digit (7) from the dividend, add it to 44, then carry on: 447 / 66

Step 6:
When dividing 447 by 66, we get 6 with a remainder of 51.
Write down 6 as next digit of the result. 
Result so far: 7926.0
If we subtract 396 from 447, we get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 7:
510 divided by 66 is 7 with a remainder of 48.
Use 7 as the next digit of our solution. 
Result so far: 7926.7
The remainder is 48 after subtracting 462 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 8:
480 divided by 66 is 7 with a remainder of 18.
Record the quotient 7 as the next digit in the result. 
Result so far: 7926.77
The remainder is 18 after subtracting 462 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final result is 7926.77 with a remainder of 0.018.