We look at the division of 790357 by 66 
The aim is to understand the frequency of 66 in 790357.

Step 1:
66 can be fit into 7 0 times, resulting in 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.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 66

Step 2:
If we divide 79 by 66, we get 1 and a remainder of 13.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 66 from 79, we get 13.
Fetch the next digit (0) from the dividend, attach it to 13 and continue: 130 / 66

Going ahead to step 3:
66 can be fit into 130 1 times, resulting in a remainder of 64.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Deduct 66 from 130 and we're left with 64.
Fetch the next digit (3) from the dividend, attach it to 64 and continue: 643 / 66

On to step 4:
643 divided by 66 is 9 with a remainder of 49.
Use 9 as the next digit of our solution. 
Result so far: 119.0
Deduct 594 from 643 and we're left with 49.
Grab the next digit (5) from the dividend, add it to 49, then carry on: 495 / 66

Going ahead to step 5:
66 can be fit into 495 7 times, resulting in a remainder of 33.
The number 7 becomes the next digit in our result. 
Result so far: 1197.0
If we take 462 away from 495, we end up with 33.
Bring next digit (7) of the dividend behind the 33 and repeat the process: 337 / 66

On to step 6:
337 divided by 66 is 5 with a remainder of 7.
The next digit of our result is 5. 
Result so far: 11975.0
Subtract 330 from 337 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
If we divide 70 by 66, we get 1 and a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 11975.1
If we take 66 away from 70, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 8:
The number 66 fits into 40 0 times, leaving a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 11975.1
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 9:
400 divided by 66 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 11975.106
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 10:
40 divided by 66 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 11975.106
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 11:
66 goes into 400 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 11975.10606
Deduct 396 from 400 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 12:
The number 66 fits into 40 0 times, leaving a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 11975.10606
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 13:
The number 66 fits into 400 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 11975.1060606
Subtract 396 from 400 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 14:
66 goes into 40 0 times with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 11975.1060606
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 11975.1060606, with a leftover of 4e-08.