We're dividing 647648 by 66 
The aim is to understand the frequency of 66 in 647648.

On to step 1:
6 divided by 66 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 66

Let's proceed to step 2:
64 divided by 66 is 0 with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Fetch the next digit (7) from the dividend, attach it to 64 and continue: 647 / 66

On to step 3:
66 can be fit into 647 9 times, resulting in a remainder of 53.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we subtract 594 from 647, we get 53.
Grab the next digit (6) from the dividend, add it to 53, then carry on: 536 / 66

Let's proceed to step 4:
536 divided by 66 is 8 with a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 98.0
Deduct 528 from 536 and we're left with 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 66

Advancing to step 5:
If we divide 84 by 66, we get 1 and a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 981.0
Subtract 66 from 84 to get 18.
Include the next digit (8) from the dividend after 18, then repeat: 188 / 66

Step 6:
When dividing 188 by 66, we get 2 with a remainder of 56.
Record the quotient 2 as the next digit in the result. 
Result so far: 9812.0
The remainder is 56 after subtracting 132 from 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 7:
66 can be fit into 560 8 times, resulting in a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 9812.8
If we subtract 528 from 560, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 8:
320 divided by 66 is 4 with a remainder of 56.
The next digit of our result is 4. 
Result so far: 9812.84
Deduct 264 from 320 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 9:
560 divided by 66 is 8 with a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 9812.848
Subtracting 528 from 560 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 10:
When dividing 320 by 66, we get 4 with a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 9812.8484
Subtract 264 from 320 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 11:
560 divided by 66 is 8 with a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 9812.84848
Subtract 528 from 560 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 12:
66 can be fit into 320 4 times, resulting in a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 9812.848484
Subtract 264 from 320 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 13:
66 goes into 560 8 times with a remainder of 32.
The next digit of our result is 8. 
Result so far: 9812.8484848
The remainder is 32 after subtracting 528 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 14:
The number 66 fits into 320 4 times, leaving a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 9812.84848484
The remainder is 56 after subtracting 264 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Our division results in 9812.84848484 with a remaining 5.6e-08.