We divide 135399 by 15
Our goal is to divide 135399 by 15.

On to step 1:
When dividing 1 by 15, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 15

Going ahead to step 2:
15 can be fit into 13 0 times, resulting in a remainder of 13.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 13, we get 13.
Grab the next digit (5) from the dividend, add it to 13, then carry on: 135 / 15

Let's proceed to step 3:
When dividing 135 by 15, we get 9 with a remainder of 0.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 135 from 135 and we're left with 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 15

Step 4:
15 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 90.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 15

Moving on to step 5:
If we divide 39 by 15, we get 2 and a remainder of 9.
The next digit of our result is 2. 
Result so far: 902.0
The remainder is 9 after subtracting 30 from 39.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 15

Step 6:
99 divided by 15 is 6 with a remainder of 9.
Record the quotient 6 as the next digit in the result. 
Result so far: 9026.0
If we take 90 away from 99, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
The number 15 fits into 90 6 times, leaving a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 9026.6
Subtracting 90 from 90 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
0 divided by 15 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9026.6
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9026.6
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 9026.6 with a remaining 0.0.