252651 ÷ 66 
The aim is to understand the frequency of 66 in 252651.

Step 1:
If we divide 2 by 66, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 66

Advancing to step 2:
66 can be fit into 25 0 times, resulting in a remainder of 25.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 25 after subtracting 0 from 25.
Fetch the next digit (2) from the dividend, attach it to 25 and continue: 252 / 66

Moving on to step 3:
66 goes into 252 3 times with a remainder of 54.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 198 from 252 leaves us with 54.
Grab the next digit (6) from the dividend, add it to 54, then carry on: 546 / 66

Going ahead to step 4:
When dividing 546 by 66, we get 8 with a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 38.0
Subtracting 528 from 546 leaves us with 18.
Fetch the next digit (5) from the dividend, attach it to 18 and continue: 185 / 66

On to step 5:
The number 66 fits into 185 2 times, leaving a remainder of 53.
The number 2 becomes the next digit in our result. 
Result so far: 382.0
Deduct 132 from 185 and we're left with 53.
Grab the next digit (1) from the dividend, add it to 53, then carry on: 531 / 66

On to step 6:
When dividing 531 by 66, we get 8 with a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 3828.0
Deduct 528 from 531 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
30 divided by 66 is 0 with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 3828.0
Subtracting 0 from 30 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.

On to step 8:
300 divided by 66 is 4 with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 3828.04
The remainder is 36 after subtracting 264 from 300.
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 9:
360 divided by 66 is 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 3828.045
Subtract 330 from 360 to 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.

On to step 10:
66 goes into 300 4 times with a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 3828.0454
If we subtract 264 from 300, we 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.

Going ahead to step 11:
When dividing 360 by 66, we get 5 with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 3828.04545
Subtract 330 from 360 to 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 12:
66 can be fit into 300 4 times, resulting in a remainder of 36.
The next digit of our result is 4. 
Result so far: 3828.045454
The remainder is 36 after subtracting 264 from 300.
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 13:
The number 66 fits into 360 5 times, leaving a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 3828.0454545
The remainder is 30 after subtracting 330 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 14:
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: 3828.04545454
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.

The final outcome is 3828.04545454, with a leftover of 3.6e-08.