We look at the division of 43759 by 66 
The aim is to understand the frequency of 66 in 43759.

Step 1:
66 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 66

On to step 2:
If we divide 43 by 66, we get 0 and a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 43, we end up with 43.
Take the next digit (7) from the dividend and append it to 43, then repeat: 437 / 66

On to step 3:
The number 66 fits into 437 6 times, leaving a remainder of 41.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we take 396 away from 437, we end up with 41.
Bring next digit (5) of the dividend behind the 41 and repeat the process: 415 / 66

Step 4:
66 can be fit into 415 6 times, resulting in a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 66.0
Subtracting 396 from 415 leaves us with 19.
Take the next digit (9) from the dividend and append it to 19, then repeat: 199 / 66

Going ahead to step 5:
If we divide 199 by 66, we get 3 and a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 663.0
If we take 198 away from 199, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 6:
If we divide 10 by 66, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 663.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
If we divide 100 by 66, we get 1 and a remainder of 34.
The next digit of our result is 1. 
Result so far: 663.01
Subtract 66 from 100 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 8:
66 goes into 340 5 times with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 663.015
Deduct 330 from 340 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
When dividing 100 by 66, we get 1 with a remainder of 34.
The next digit of our result is 1. 
Result so far: 663.0151
If we subtract 66 from 100, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 10:
If we divide 340 by 66, we get 5 and a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 663.01515
If we subtract 330 from 340, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 11:
The number 66 fits into 100 1 times, leaving a remainder of 34.
The next digit of our result is 1. 
Result so far: 663.015151
If we subtract 66 from 100, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 12:
The number 66 fits into 340 5 times, leaving a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 663.0151515
Deduct 330 from 340 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 13:
66 can be fit into 100 1 times, resulting in a remainder of 34.
The number 1 becomes the next digit in our result. 
Result so far: 663.01515151
If we take 66 away from 100, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

The final result is 663.01515151 with a remainder of 3.4e-08.