We're dividing 393404 by 66 
We want to divide 393404 by 66.

Step 1:
When dividing 3 by 66, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 66

Going ahead to step 2:
66 can be fit into 39 0 times, resulting in a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Grab the next digit (3) from the dividend, add it to 39, then carry on: 393 / 66

Going ahead to step 3:
393 divided by 66 is 5 with a remainder of 63.
The next digit of our result is 5. 
Result so far: 5.0
The remainder is 63 after subtracting 330 from 393.
Append the next digit (4) from the dividend to 63 and continue with: 634 / 66

Moving on to step 4:
The number 66 fits into 634 9 times, leaving a remainder of 40.
Write down 9 as next digit of the result. 
Result so far: 59.0
The remainder is 40 after subtracting 594 from 634.
Grab the next digit (0) from the dividend, add it to 40, then carry on: 400 / 66

On to step 5:
66 goes into 400 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 596.0
Subtracting 396 from 400 leaves us with 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 66

On to step 6:
The number 66 fits into 44 0 times, leaving a remainder of 44.
Write down 0 as next digit of the result. 
Result so far: 5960.0
If we subtract 0 from 44, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 7:
440 divided by 66 is 6 with a remainder of 44.
The next digit of our result is 6. 
Result so far: 5960.6
If we take 396 away from 440, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 8:
66 goes into 440 6 times with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 5960.66
If we take 396 away from 440, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

After the division, we end up with 5960.66 and a remainder of 0.044.