We look at the division of 759789 by 66 
The aim is to understand the frequency of 66 in 759789.

Step 1:
66 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 66

On to step 2:
66 goes into 75 1 times with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 66 from 75 and we're left with 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 66

Going ahead to step 3:
66 can be fit into 99 1 times, resulting in a remainder of 33.
Use 1 as the next digit of our solution. 
Result so far: 11.0
Subtracting 66 from 99 leaves us with 33.
Take the next digit (7) from the dividend and append it to 33, then repeat: 337 / 66

Let's proceed to step 4:
The number 66 fits into 337 5 times, leaving a remainder of 7.
The next digit of our result is 5. 
Result so far: 115.0
Deduct 330 from 337 and we're left with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 66

Advancing to step 5:
66 goes into 78 1 times with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 1151.0
If we subtract 66 from 78, we get 12.
Include the next digit (9) from the dividend after 12, then repeat: 129 / 66

On to step 6:
66 can be fit into 129 1 times, resulting in a remainder of 63.
Use 1 as the next digit of our solution. 
Result so far: 11511.0
Subtracting 66 from 129 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 7:
66 goes into 630 9 times with a remainder of 36.
Record the quotient 9 as the next digit in the result. 
Result so far: 11511.9
Deduct 594 from 630 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 8:
66 can be fit into 360 5 times, resulting in a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 11511.95
If we take 330 away from 360, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 9:
The number 66 fits into 300 4 times, leaving a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 11511.954
The remainder is 36 after subtracting 264 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 10:
When dividing 360 by 66, we get 5 with a remainder of 30.
The next digit of our result is 5. 
Result so far: 11511.9545
Deduct 330 from 360 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
If we divide 300 by 66, we get 4 and a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 11511.95454
If we subtract 264 from 300, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 12:
66 can be fit into 360 5 times, resulting in a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 11511.954545
If we take 330 away from 360, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 13:
If we divide 300 by 66, we get 4 and a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 11511.9545454
If we take 264 away from 300, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 14:
360 divided by 66 is 5 with a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 11511.95454545
Subtracting 330 from 360 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

After the division, we end up with 11511.95454545 and a remainder of 3e-08.