We're dividing 36428 by 66 
The aim is to understand the frequency of 66 in 36428.

Step 1:
3 divided by 66 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 66

On to step 2:
66 can be fit into 36 0 times, resulting in a remainder of 36.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 36, we end up with 36.
Include the next digit (4) from the dividend after 36, then repeat: 364 / 66

Going ahead to step 3:
66 can be fit into 364 5 times, resulting in a remainder of 34.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 330 from 364, we get 34.
Bring next digit (2) of the dividend behind the 34 and repeat the process: 342 / 66

Let's proceed to step 4:
The number 66 fits into 342 5 times, leaving a remainder of 12.
The next digit of our result is 5. 
Result so far: 55.0
The remainder is 12 after subtracting 330 from 342.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 66

Advancing to step 5:
66 goes into 128 1 times with a remainder of 62.
Put 1 as the next digit of the answer. 
Result so far: 551.0
If we take 66 away from 128, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 6:
620 divided by 66 is 9 with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 551.9
The remainder is 26 after subtracting 594 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 7:
If we divide 260 by 66, we get 3 and a remainder of 62.
The next digit of our result is 3. 
Result so far: 551.93
The remainder is 62 after subtracting 198 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 8:
The number 66 fits into 620 9 times, leaving a remainder of 26.
Write down 9 as next digit of the result. 
Result so far: 551.939
Subtract 594 from 620 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 9:
When dividing 260 by 66, we get 3 with a remainder of 62.
The next digit of our result is 3. 
Result so far: 551.9393
If we subtract 198 from 260, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 10:
66 goes into 620 9 times with a remainder of 26.
Put 9 as the next digit of the answer. 
Result so far: 551.93939
Subtract 594 from 620 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 11:
The number 66 fits into 260 3 times, leaving a remainder of 62.
Record the quotient 3 as the next digit in the result. 
Result so far: 551.939393
If we take 198 away from 260, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 12:
The number 66 fits into 620 9 times, leaving a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 551.9393939
Subtracting 594 from 620 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 13:
When dividing 260 by 66, we get 3 with a remainder of 62.
Use 3 as the next digit of our solution. 
Result so far: 551.93939393
If we take 198 away from 260, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Our division results in 551.93939393 with a remaining 6.2e-08.