163405 ÷ 66 
The aim is to understand the frequency of 66 in 163405.

On to step 1:
If we divide 1 by 66, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 66

Going ahead to step 2:
When dividing 16 by 66, we get 0 with a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 16, we get 16.
Include the next digit (3) from the dividend after 16, then repeat: 163 / 66

Going ahead to step 3:
The number 66 fits into 163 2 times, leaving a remainder of 31.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 132 from 163 to get 31.
Append the next digit (4) from the dividend to 31 and continue with: 314 / 66

Let's proceed to step 4:
66 can be fit into 314 4 times, resulting in a remainder of 50.
The next digit of our result is 4. 
Result so far: 24.0
If we take 264 away from 314, we end up with 50.
Fetch the next digit (0) from the dividend, attach it to 50 and continue: 500 / 66

Moving on to step 5:
500 divided by 66 is 7 with a remainder of 38.
The next digit of our result is 7. 
Result so far: 247.0
The remainder is 38 after subtracting 462 from 500.
Append the next digit (5) from the dividend to 38 and continue with: 385 / 66

Let's proceed to step 6:
When dividing 385 by 66, we get 5 with a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 2475.0
Deduct 330 from 385 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 7:
550 divided by 66 is 8 with a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 2475.8
If we take 528 away from 550, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 8:
The number 66 fits into 220 3 times, leaving a remainder of 22.
Record the quotient 3 as the next digit in the result. 
Result so far: 2475.83
Subtracting 198 from 220 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 9:
66 goes into 220 3 times with a remainder of 22.
The next digit of our result is 3. 
Result so far: 2475.833
Subtract 198 from 220 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The final result is 2475.833 with a remainder of 0.0022.