We look at the division of 71952 by 66 
The aim is to understand the frequency of 66 in 71952.

On to step 1:
If we divide 7 by 66, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 66

On to step 2:
If we divide 71 by 66, we get 1 and a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 66 from 71 and we're left with 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 66

Going ahead to step 3:
If we divide 59 by 66, we get 0 and a remainder of 59.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we take 0 away from 59, we end up with 59.
Append the next digit (5) from the dividend to 59 and continue with: 595 / 66

Let's proceed to step 4:
If we divide 595 by 66, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 109.0
Subtracting 594 from 595 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 66

Moving on to step 5:
When dividing 12 by 66, we get 0 with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 1090.0
Subtract 0 from 12 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.

On to step 6:
66 can be fit into 120 1 times, resulting in a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 1090.1
Subtract 66 from 120 to 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 7:
When dividing 540 by 66, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 1090.18
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 8:
The number 66 fits into 120 1 times, leaving a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 1090.181
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.

Advancing to step 9:
The number 66 fits into 540 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 1090.1818
If we subtract 528 from 540, we 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.

Advancing to step 10:
The number 66 fits into 120 1 times, leaving a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 1090.18181
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.

Let's proceed to step 11:
If we divide 540 by 66, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 1090.181818
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.

Advancing to step 12:
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: 1090.1818181
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.

On to step 13:
540 divided by 66 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 1090.18181818
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.

In conclusion, the division gives 1090.18181818 with a balance of 1.2e-08.