396259 ÷ 66 
The aim is to understand the frequency of 66 in 396259.

Step 1:
If we divide 3 by 66, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 66

Step 2:
66 can be fit into 39 0 times, resulting in a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Include the next digit (6) from the dividend after 39, then repeat: 396 / 66

Let's proceed to step 3:
If we divide 396 by 66, we get 6 and a remainder of 0.
The next digit of our result is 6. 
Result so far: 6.0
The remainder is 0 after subtracting 396 from 396.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 66

Step 4:
66 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 60.0
Subtract 0 from 2 to get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 66

On to step 5:
When dividing 25 by 66, we get 0 with a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 600.0
If we take 0 away from 25, we end up with 25.
Append the next digit (9) from the dividend to 25 and continue with: 259 / 66

Step 6:
If we divide 259 by 66, we get 3 and a remainder of 61.
Record the quotient 3 as the next digit in the result. 
Result so far: 6003.0
Deduct 198 from 259 and we're left with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 7:
The number 66 fits into 610 9 times, leaving a remainder of 16.
Write down 9 as next digit of the result. 
Result so far: 6003.9
Deduct 594 from 610 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 8:
66 can be fit into 160 2 times, resulting in a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 6003.92
If we subtract 132 from 160, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 9:
66 goes into 280 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 6003.924
The remainder is 16 after subtracting 264 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 10:
66 goes into 160 2 times with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 6003.9242
Subtract 132 from 160 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 11:
When dividing 280 by 66, we get 4 with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 6003.92424
If we take 264 away from 280, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 12:
The number 66 fits into 160 2 times, leaving a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 6003.924242
If we take 132 away from 160, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 13:
When dividing 280 by 66, we get 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 6003.9242424
If we subtract 264 from 280, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 14:
The number 66 fits into 160 2 times, leaving a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 6003.92424242
If we take 132 away from 160, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The quotient of the division is 6003.92424242, and the remainder is 2.8e-08.