We divide 390158 by 15
We want to figure out the number of times 390158 can be divided by 15.

On to step 1:
The number 15 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 15

On to step 2:
15 goes into 39 2 times with a remainder of 9.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 30 from 39 leaves us with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 15

Moving on to step 3:
The number 15 fits into 90 6 times, leaving a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 26.0
If we take 90 away from 90, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 15

Step 4:
The number 15 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 260.0
If we subtract 0 from 1, we get 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 15

Step 5:
15 divided by 15 is 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 2601.0
If we take 15 away from 15, we end up with 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 15

On to step 6:
8 divided by 15 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 26010.0
Subtract 0 from 8 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 7:
The number 15 fits into 80 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 26010.5
Deduct 75 from 80 and we're left 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.

On to step 8:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 26010.53
If we subtract 45 from 50, we 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.

Advancing to step 9:
If we divide 50 by 15, we get 3 and a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 26010.533
If we subtract 45 from 50, we 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.

In conclusion, the division gives 26010.533 with a balance of 0.0005.