We divide 393999 by 24
We want to divide 393999 by 24.

Let's proceed to step 1:
24 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 24

Going ahead to step 2:
24 can be fit into 39 1 times, resulting in a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 24 from 39, we get 15.
Take the next digit (3) from the dividend and append it to 15, then repeat: 153 / 24

Moving on to step 3:
24 goes into 153 6 times with a remainder of 9.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtract 144 from 153 to get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 24

Step 4:
When dividing 99 by 24, we get 4 with a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 164.0
Subtracting 96 from 99 leaves us with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 24

Advancing to step 5:
If we divide 39 by 24, we get 1 and a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 1641.0
If we take 24 away from 39, we end up with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 24

Let's proceed to step 6:
24 can be fit into 159 6 times, resulting in a remainder of 15.
The number 6 becomes the next digit in our result. 
Result so far: 16416.0
If we take 144 away from 159, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 7:
If we divide 150 by 24, we get 6 and a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 16416.6
Subtract 144 from 150 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
24 can be fit into 60 2 times, resulting in a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 16416.62
Subtract 48 from 60 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
If we divide 120 by 24, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 16416.625
Subtract 120 from 120 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
The number 24 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 16416.625
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
0 divided by 24 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 16416.625
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 16416.625, and the remainder is 0.0.