We look at the division of 399380 by 15 
We want to divide 399380 by 15.

On to step 1:
When dividing 3 by 15, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 15

Moving on to step 2:
15 goes into 39 2 times with a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 30 from 39 and we're left with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 15

On to step 3:
99 divided by 15 is 6 with a remainder of 9.
The next digit of our result is 6. 
Result so far: 26.0
If we take 90 away from 99, we end up with 9.
Bring next digit (3) of the dividend behind the 9 and repeat the process: 93 / 15

Step 4:
If we divide 93 by 15, we get 6 and a remainder of 3.
The next digit of our result is 6. 
Result so far: 266.0
Deduct 90 from 93 and we're left with 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 15

Let's proceed to step 5:
15 can be fit into 38 2 times, resulting in a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 2662.0
Deduct 30 from 38 and we're left with 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 15

Let's proceed to step 6:
If we divide 80 by 15, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 26625.0
If we take 75 away from 80, 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.

Going ahead to step 7:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 26625.3
If we take 45 away from 50, 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.

Going ahead to step 8:
50 divided by 15 is 3 with a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 26625.33
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 26625.33 with a remainder of 0.005.