We look at the division of 399411 by 23 
We want to figure out the number of times 399411 can be divided by 23.

Moving on to step 1:
If we divide 3 by 23, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 23

Advancing to step 2:
23 can be fit into 39 1 times, resulting in a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 16 after subtracting 23 from 39.
Bring next digit (9) of the dividend behind the 16 and repeat the process: 169 / 23

Going ahead to step 3:
If we divide 169 by 23, we get 7 and a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we take 161 away from 169, we end up with 8.
Append the next digit (4) from the dividend to 8 and continue with: 84 / 23

Moving on to step 4:
The number 23 fits into 84 3 times, leaving a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 173.0
Subtracting 69 from 84 leaves us with 15.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 23

On to step 5:
23 goes into 151 6 times with a remainder of 13.
Put 6 as the next digit of the answer. 
Result so far: 1736.0
The remainder is 13 after subtracting 138 from 151.
Grab the next digit (1) from the dividend, add it to 13, then carry on: 131 / 23

On to step 6:
If we divide 131 by 23, we get 5 and a remainder of 16.
Use 5 as the next digit of our solution. 
Result so far: 17365.0
If we subtract 115 from 131, 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.

Let's proceed to step 7:
23 goes into 160 6 times with a remainder of 22.
Use 6 as the next digit of our solution. 
Result so far: 17365.6
If we take 138 away from 160, 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.

Moving on to step 8:
When dividing 220 by 23, we get 9 with a remainder of 13.
The next digit of our result is 9. 
Result so far: 17365.69
If we subtract 207 from 220, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 9:
The number 23 fits into 130 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 17365.695
The remainder is 15 after subtracting 115 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 10:
150 divided by 23 is 6 with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 17365.6956
If we take 138 away from 150, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 11:
When dividing 120 by 23, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 17365.69565
If we take 115 away from 120, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 12:
23 goes into 50 2 times with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 17365.695652
If we subtract 46 from 50, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 13:
40 divided by 23 is 1 with a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 17365.6956521
The remainder is 17 after subtracting 23 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 14:
The number 23 fits into 170 7 times, leaving a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 17365.69565217
The remainder is 9 after subtracting 161 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

The final outcome is 17365.69565217, with a leftover of 9e-09.