We're dividing 399423 by 33 
We want to figure out the number of times 399423 can be divided by 33.

Let's proceed to step 1:
33 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 33

Going ahead to step 2:
The number 33 fits into 39 1 times, leaving a remainder of 6.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 33 from 39 leaves us with 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 33

Let's proceed to step 3:
The number 33 fits into 69 2 times, leaving a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we take 66 away from 69, we end up with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 33

Moving on to step 4:
If we divide 34 by 33, we get 1 and a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 121.0
Subtracting 33 from 34 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 33

Advancing to step 5:
33 can be fit into 12 0 times, resulting in a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 1210.0
The remainder is 12 after subtracting 0 from 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 33

Going ahead to step 6:
When dividing 123 by 33, we get 3 with a remainder of 24.
Put 3 as the next digit of the answer. 
Result so far: 12103.0
If we subtract 99 from 123, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 7:
33 can be fit into 240 7 times, resulting in a remainder of 9.
The next digit of our result is 7. 
Result so far: 12103.7
Deduct 231 from 240 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 8:
When dividing 90 by 33, we get 2 with a remainder of 24.
The number 2 becomes the next digit in our result. 
Result so far: 12103.72
Deduct 66 from 90 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 9:
33 can be fit into 240 7 times, resulting in a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 12103.727
Deduct 231 from 240 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 10:
33 can be fit into 90 2 times, resulting in a remainder of 24.
The next digit of our result is 2. 
Result so far: 12103.7272
If we take 66 away from 90, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 11:
240 divided by 33 is 7 with a remainder of 9.
The next digit of our result is 7. 
Result so far: 12103.72727
Subtracting 231 from 240 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 12:
33 goes into 90 2 times with a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 12103.727272
If we take 66 away from 90, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 13:
240 divided by 33 is 7 with a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 12103.7272727
If we subtract 231 from 240, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 14:
90 divided by 33 is 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 12103.72727272
The remainder is 24 after subtracting 66 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final outcome is 12103.72727272, with a leftover of 2.4e-08.