We look at the division of 764671 by 66 
The aim is to understand the frequency of 66 in 764671.

Going ahead to step 1:
66 goes into 7 0 times with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (6) from the dividend, add it to 7, then carry on: 76 / 66

On to step 2:
66 goes into 76 1 times with a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 66 away from 76, we end up with 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 66

On to step 3:
66 goes into 104 1 times with a remainder of 38.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Deduct 66 from 104 and we're left with 38.
Append the next digit (6) from the dividend to 38 and continue with: 386 / 66

Step 4:
386 divided by 66 is 5 with a remainder of 56.
Put 5 as the next digit of the answer. 
Result so far: 115.0
Deduct 330 from 386 and we're left with 56.
Bring next digit (7) of the dividend behind the 56 and repeat the process: 567 / 66

Moving on to step 5:
567 divided by 66 is 8 with a remainder of 39.
The number 8 becomes the next digit in our result. 
Result so far: 1158.0
Subtracting 528 from 567 leaves us with 39.
Take the next digit (1) from the dividend and append it to 39, then repeat: 391 / 66

Moving on to step 6:
66 goes into 391 5 times with a remainder of 61.
The number 5 becomes the next digit in our result. 
Result so far: 11585.0
If we take 330 away from 391, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 7:
66 goes into 610 9 times with a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 11585.9
If we subtract 594 from 610, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 8:
If we divide 160 by 66, we get 2 and a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 11585.92
Subtract 132 from 160 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 9:
When dividing 280 by 66, we get 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 11585.924
Subtract 264 from 280 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 10:
66 can be fit into 160 2 times, resulting in a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 11585.9242
Deduct 132 from 160 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 11:
66 goes into 280 4 times with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 11585.92424
Subtracting 264 from 280 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 12:
160 divided by 66 is 2 with a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 11585.924242
If we subtract 132 from 160, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 13:
280 divided by 66 is 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 11585.9242424
Subtract 264 from 280 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 14:
If we divide 160 by 66, we get 2 and a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 11585.92424242
If we subtract 132 from 160, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Our division results in 11585.92424242 with a remaining 2.8e-08.