We look at the division of 39219371 by 66 
The aim is to understand the frequency of 66 in 39219371.

Let's proceed to step 1:
3 divided by 66 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 66

Moving on to step 2:
66 can be fit into 39 0 times, resulting in a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Include the next digit (2) from the dividend after 39, then repeat: 392 / 66

On to step 3:
66 goes into 392 5 times with a remainder of 62.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 330 from 392, we get 62.
Include the next digit (1) from the dividend after 62, then repeat: 621 / 66

Going ahead to step 4:
621 divided by 66 is 9 with a remainder of 27.
Put 9 as the next digit of the answer. 
Result so far: 59.0
If we subtract 594 from 621, we get 27.
Append the next digit (9) from the dividend to 27 and continue with: 279 / 66

Advancing to step 5:
If we divide 279 by 66, we get 4 and a remainder of 15.
Put 4 as the next digit of the answer. 
Result so far: 594.0
Subtracting 264 from 279 leaves us with 15.
Bring next digit (3) of the dividend behind the 15 and repeat the process: 153 / 66

Advancing to step 6:
When dividing 153 by 66, we get 2 with a remainder of 21.
Record the quotient 2 as the next digit in the result. 
Result so far: 5942.0
Subtract 132 from 153 to get 21.
Append the next digit (7) from the dividend to 21 and continue with: 217 / 66

Advancing to step 7:
If we divide 217 by 66, we get 3 and a remainder of 19.
The next digit of our result is 3. 
Result so far: 59423.0
Subtract 198 from 217 to get 19.
Fetch the next digit (1) from the dividend, attach it to 19 and continue: 191 / 66

Advancing to step 8:
191 divided by 66 is 2 with a remainder of 59.
Use 2 as the next digit of our solution. 
Result so far: 594232.0
Subtract 132 from 191 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 9:
If we divide 590 by 66, we get 8 and a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 594232.8
If we take 528 away from 590, we end up 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 10:
620 divided by 66 is 9 with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 594232.89
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.

Moving on to step 11:
260 divided by 66 is 3 with a remainder of 62.
Use 3 as the next digit of our solution. 
Result so far: 594232.893
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.

Step 12:
66 can be fit into 620 9 times, resulting in a remainder of 26.
The number 9 becomes the next digit in our result. 
Result so far: 594232.8939
Deduct 594 from 620 and we're left 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.

Let's proceed to step 13:
The number 66 fits into 260 3 times, leaving a remainder of 62.
Write down 3 as next digit of the result. 
Result so far: 594232.89393
Deduct 198 from 260 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.

Let's proceed to step 14:
When dividing 620 by 66, we get 9 with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 594232.893939
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.

Moving on to step 15:
66 can be fit into 260 3 times, resulting in a remainder of 62.
Write down 3 as next digit of the result. 
Result so far: 594232.8939393
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.

Moving on to step 16:
When dividing 620 by 66, we get 9 with a remainder of 26.
Put 9 as the next digit of the answer. 
Result so far: 594232.89393939
Deduct 594 from 620 and we're left 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.

The quotient of the division is 594232.89393939, and the remainder is 2.6e-08.