We look at the division of 275454 by 66 
The aim is to understand the frequency of 66 in 275454.

Let's proceed to step 1:
2 divided by 66 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 66

Moving on to step 2:
66 goes into 27 0 times with a remainder of 27.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 27, we end up with 27.
Fetch the next digit (5) from the dividend, attach it to 27 and continue: 275 / 66

On to step 3:
275 divided by 66 is 4 with a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 264 from 275 and we're left with 11.
Take the next digit (4) from the dividend and append it to 11, then repeat: 114 / 66

Moving on to step 4:
114 divided by 66 is 1 with a remainder of 48.
The next digit of our result is 1. 
Result so far: 41.0
Subtracting 66 from 114 leaves us with 48.
Fetch the next digit (5) from the dividend, attach it to 48 and continue: 485 / 66

Advancing to step 5:
When dividing 485 by 66, we get 7 with a remainder of 23.
The next digit of our result is 7. 
Result so far: 417.0
Subtracting 462 from 485 leaves us with 23.
Bring next digit (4) of the dividend behind the 23 and repeat the process: 234 / 66

Let's proceed to step 6:
The number 66 fits into 234 3 times, leaving a remainder of 36.
Put 3 as the next digit of the answer. 
Result so far: 4173.0
Subtracting 198 from 234 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 7:
360 divided by 66 is 5 with a remainder of 30.
The next digit of our result is 5. 
Result so far: 4173.5
Subtracting 330 from 360 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
300 divided by 66 is 4 with a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 4173.54
If we take 264 away from 300, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 9:
66 can be fit into 360 5 times, resulting in a remainder of 30.
The next digit of our result is 5. 
Result so far: 4173.545
Deduct 330 from 360 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 10:
66 can be fit into 300 4 times, resulting in a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 4173.5454
If we take 264 away from 300, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 11:
The number 66 fits into 360 5 times, leaving a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 4173.54545
If we subtract 330 from 360, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 12:
The number 66 fits into 300 4 times, leaving a remainder of 36.
The next digit of our result is 4. 
Result so far: 4173.545454
Deduct 264 from 300 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 13:
If we divide 360 by 66, we get 5 and a remainder of 30.
The next digit of our result is 5. 
Result so far: 4173.5454545
If we subtract 330 from 360, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 14:
If we divide 300 by 66, we get 4 and a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 4173.54545454
Subtract 264 from 300 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final result is 4173.54545454 with a remainder of 3.6e-08.