We look at the division of 181440 by 66 
The aim is to understand the frequency of 66 in 181440.

Step 1:
1 divided by 66 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 66

Step 2:
66 goes into 18 0 times with a remainder of 18.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Grab the next digit (1) from the dividend, add it to 18, then carry on: 181 / 66

Moving on to step 3:
66 can be fit into 181 2 times, resulting in a remainder of 49.
The next digit of our result is 2. 
Result so far: 2.0
If we take 132 away from 181, we end up with 49.
Fetch the next digit (4) from the dividend, attach it to 49 and continue: 494 / 66

Step 4:
If we divide 494 by 66, we get 7 and a remainder of 32.
The next digit of our result is 7. 
Result so far: 27.0
If we subtract 462 from 494, we get 32.
Fetch the next digit (4) from the dividend, attach it to 32 and continue: 324 / 66

Going ahead to step 5:
324 divided by 66 is 4 with a remainder of 60.
The number 4 becomes the next digit in our result. 
Result so far: 274.0
If we take 264 away from 324, we end up with 60.
Fetch the next digit (0) from the dividend, attach it to 60 and continue: 600 / 66

Step 6:
66 goes into 600 9 times with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 2749.0
Deduct 594 from 600 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
60 divided by 66 is 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 2749.0
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 8:
66 goes into 600 9 times with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 2749.09
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
The number 66 fits into 60 0 times, leaving a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 2749.09
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 10:
66 goes into 600 9 times with a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 2749.0909
If we take 594 away from 600, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
60 divided by 66 is 0 with a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 2749.0909
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 12:
If we divide 600 by 66, we get 9 and a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 2749.090909
Subtracting 594 from 600 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 13:
When dividing 60 by 66, we get 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 2749.090909
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 14:
If we divide 600 by 66, we get 9 and a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 2749.09090909
Subtracting 594 from 600 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 2749.09090909 with a remainder of 6e-09.