120391 ÷ 15 
We want to divide 120391 by 15.

Moving on to step 1:
15 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 15

Moving on to step 2:
15 goes into 12 0 times with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 15

Let's proceed to step 3:
If we divide 120 by 15, we get 8 and a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 120 from 120 leaves us with 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 15

Moving on to step 4:
When dividing 3 by 15, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 80.0
If we take 0 away from 3, we end up with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 15

Moving on to step 5:
When dividing 39 by 15, we get 2 with a remainder of 9.
The next digit of our result is 2. 
Result so far: 802.0
If we take 30 away from 39, we end up with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 15

Moving on to step 6:
When dividing 91 by 15, we get 6 with a remainder of 1.
The next digit of our result is 6. 
Result so far: 8026.0
If we take 90 away from 91, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
15 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 8026.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 8026.06
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 8026.066
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 8026.066 and a remainder of 0.001.