We look at the division of 518989 by 66 
The aim is to understand the frequency of 66 in 518989.

Moving on to step 1:
The number 66 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 66

Moving on to step 2:
The number 66 fits into 51 0 times, leaving a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Take the next digit (8) from the dividend and append it to 51, then repeat: 518 / 66

On to step 3:
When dividing 518 by 66, we get 7 with a remainder of 56.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtract 462 from 518 to get 56.
Append the next digit (9) from the dividend to 56 and continue with: 569 / 66

Moving on to step 4:
66 goes into 569 8 times with a remainder of 41.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
If we subtract 528 from 569, we get 41.
Include the next digit (8) from the dividend after 41, then repeat: 418 / 66

On to step 5:
The number 66 fits into 418 6 times, leaving a remainder of 22.
Write down 6 as next digit of the result. 
Result so far: 786.0
If we take 396 away from 418, we end up with 22.
Append the next digit (9) from the dividend to 22 and continue with: 229 / 66

Step 6:
If we divide 229 by 66, we get 3 and a remainder of 31.
Write down 3 as next digit of the result. 
Result so far: 7863.0
Subtracting 198 from 229 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 7:
When dividing 310 by 66, we get 4 with a remainder of 46.
Use 4 as the next digit of our solution. 
Result so far: 7863.4
Subtract 264 from 310 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 8:
460 divided by 66 is 6 with a remainder of 64.
The next digit of our result is 6. 
Result so far: 7863.46
If we take 396 away from 460, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 9:
The number 66 fits into 640 9 times, leaving a remainder of 46.
Put 9 as the next digit of the answer. 
Result so far: 7863.469
If we take 594 away from 640, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 10:
If we divide 460 by 66, we get 6 and a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 7863.4696
If we subtract 396 from 460, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 11:
If we divide 640 by 66, we get 9 and a remainder of 46.
The next digit of our result is 9. 
Result so far: 7863.46969
If we take 594 away from 640, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 12:
66 can be fit into 460 6 times, resulting in a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 7863.469696
Deduct 396 from 460 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 13:
640 divided by 66 is 9 with a remainder of 46.
Use 9 as the next digit of our solution. 
Result so far: 7863.4696969
Deduct 594 from 640 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 14:
66 can be fit into 460 6 times, resulting in a remainder of 64.
The next digit of our result is 6. 
Result so far: 7863.46969696
If we subtract 396 from 460, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

In conclusion, the division gives 7863.46969696 with a balance of 6.4e-08.