399420 divided by 23 
We want to divide 399420 by 23.

Step 1:
If we divide 3 by 23, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 23

On to step 2:
23 can be fit into 39 1 times, resulting in a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 16 after subtracting 23 from 39.
Append the next digit (9) from the dividend to 16 and continue with: 169 / 23

Step 3:
The number 23 fits into 169 7 times, leaving a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 161 from 169, we get 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 23

Going ahead to step 4:
When dividing 84 by 23, we get 3 with a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 173.0
If we subtract 69 from 84, we get 15.
Append the next digit (2) from the dividend to 15 and continue with: 152 / 23

Let's proceed to step 5:
When dividing 152 by 23, we get 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 1736.0
If we take 138 away from 152, we end up with 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 23

Going ahead to step 6:
The number 23 fits into 140 6 times, leaving a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 17366.0
If we take 138 away from 140, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 7:
If we divide 20 by 23, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 17366.0
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
The number 23 fits into 200 8 times, leaving a remainder of 16.
The next digit of our result is 8. 
Result so far: 17366.08
Subtract 184 from 200 to 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.

Moving on to step 9:
When dividing 160 by 23, we get 6 with a remainder of 22.
Put 6 as the next digit of the answer. 
Result so far: 17366.086
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.

On to step 10:
When dividing 220 by 23, we get 9 with a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 17366.0869
The remainder is 13 after subtracting 207 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 11:
23 goes into 130 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 17366.08695
Subtract 115 from 130 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
The number 23 fits into 150 6 times, leaving a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 17366.086956
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.

Advancing to step 13:
When dividing 120 by 23, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 17366.0869565
Subtracting 115 from 120 leaves us 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.

Going ahead to step 14:
23 goes into 50 2 times with a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 17366.08695652
The remainder is 4 after subtracting 46 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

After the division, we end up with 17366.08695652 and a remainder of 4e-09.