We're dividing 436159 by 66 
The aim is to understand the frequency of 66 in 436159.

On to step 1:
The number 66 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 66

Moving on to step 2:
If we divide 43 by 66, we get 0 and a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Fetch the next digit (6) from the dividend, attach it to 43 and continue: 436 / 66

Advancing to step 3:
66 can be fit into 436 6 times, resulting in a remainder of 40.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 396 from 436, we get 40.
Bring next digit (1) of the dividend behind the 40 and repeat the process: 401 / 66

On to step 4:
When dividing 401 by 66, we get 6 with a remainder of 5.
Write down 6 as next digit of the result. 
Result so far: 66.0
Subtract 396 from 401 to get 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 66

Going ahead to step 5:
55 divided by 66 is 0 with a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 660.0
Deduct 0 from 55 and we're left with 55.
Include the next digit (9) from the dividend after 55, then repeat: 559 / 66

Step 6:
66 can be fit into 559 8 times, resulting in a remainder of 31.
Put 8 as the next digit of the answer. 
Result so far: 6608.0
If we take 528 away from 559, we end up 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.

Step 7:
When dividing 310 by 66, we get 4 with a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 6608.4
If we take 264 away from 310, 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.

Advancing to step 8:
66 can be fit into 460 6 times, resulting in a remainder of 64.
The number 6 becomes the next digit in our result. 
Result so far: 6608.46
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.

Advancing to step 9:
66 goes into 640 9 times with a remainder of 46.
Use 9 as the next digit of our solution. 
Result so far: 6608.469
Subtract 594 from 640 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.

Moving on to step 10:
66 goes into 460 6 times with a remainder of 64.
Write down 6 as next digit of the result. 
Result so far: 6608.4696
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.

Advancing to step 11:
If we divide 640 by 66, we get 9 and a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 6608.46969
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.

Step 12:
66 goes into 460 6 times with a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 6608.469696
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.

Going ahead to step 13:
66 goes into 640 9 times with a remainder of 46.
The number 9 becomes the next digit in our result. 
Result so far: 6608.4696969
If we subtract 594 from 640, we 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 14:
460 divided by 66 is 6 with a remainder of 64.
The next digit of our result is 6. 
Result so far: 6608.46969696
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.

Our division results in 6608.46969696 with a remaining 6.4e-08.