54095378 ÷ 66 
The aim is to understand the frequency of 66 in 54095378.

Let's proceed to step 1:
The number 66 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 66

Moving on to step 2:
The number 66 fits into 54 0 times, leaving a remainder of 54.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 54, we end up with 54.
Bring next digit (0) of the dividend behind the 54 and repeat the process: 540 / 66

Step 3:
The number 66 fits into 540 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 528 from 540, we get 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 66

On to step 4:
66 can be fit into 129 1 times, resulting in a remainder of 63.
Put 1 as the next digit of the answer. 
Result so far: 81.0
If we take 66 away from 129, we end up with 63.
Append the next digit (5) from the dividend to 63 and continue with: 635 / 66

Advancing to step 5:
66 can be fit into 635 9 times, resulting in a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 819.0
Subtracting 594 from 635 leaves us with 41.
Include the next digit (3) from the dividend after 41, then repeat: 413 / 66

Going ahead to step 6:
66 can be fit into 413 6 times, resulting in a remainder of 17.
The number 6 becomes the next digit in our result. 
Result so far: 8196.0
Deduct 396 from 413 and we're left with 17.
Fetch the next digit (7) from the dividend, attach it to 17 and continue: 177 / 66

Step 7:
When dividing 177 by 66, we get 2 with a remainder of 45.
The number 2 becomes the next digit in our result. 
Result so far: 81962.0
Subtract 132 from 177 to get 45.
Take the next digit (8) from the dividend and append it to 45, then repeat: 458 / 66

Advancing to step 8:
The number 66 fits into 458 6 times, leaving a remainder of 62.
Record the quotient 6 as the next digit in the result. 
Result so far: 819626.0
Deduct 396 from 458 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 9:
If we divide 620 by 66, we get 9 and a remainder of 26.
Put 9 as the next digit of the answer. 
Result so far: 819626.9
The remainder is 26 after subtracting 594 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 10:
The number 66 fits into 260 3 times, leaving a remainder of 62.
Put 3 as the next digit of the answer. 
Result so far: 819626.93
Subtracting 198 from 260 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 11:
66 goes into 620 9 times with a remainder of 26.
The next digit of our result is 9. 
Result so far: 819626.939
The remainder is 26 after subtracting 594 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 12:
260 divided by 66 is 3 with a remainder of 62.
Write down 3 as next digit of the result. 
Result so far: 819626.9393
Subtract 198 from 260 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 13:
620 divided by 66 is 9 with a remainder of 26.
Write down 9 as next digit of the result. 
Result so far: 819626.93939
If we subtract 594 from 620, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 14:
The number 66 fits into 260 3 times, leaving a remainder of 62.
Record the quotient 3 as the next digit in the result. 
Result so far: 819626.939393
Subtracting 198 from 260 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 15:
When dividing 620 by 66, we get 9 with a remainder of 26.
Write down 9 as next digit of the result. 
Result so far: 819626.9393939
Subtracting 594 from 620 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 16:
The number 66 fits into 260 3 times, leaving a remainder of 62.
Use 3 as the next digit of our solution. 
Result so far: 819626.93939393
If we subtract 198 from 260, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

In conclusion, the division gives 819626.93939393 with a balance of 6.2e-08.