We're dividing 121575 by 15 
Our goal is to divide 121575 by 15.

Going ahead to step 1:
1 divided by 15 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 15

On to step 2:
15 can be fit into 12 0 times, resulting in a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 15

Advancing to step 3:
121 divided by 15 is 8 with a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 120 away from 121, we end up with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 15

Going ahead to step 4:
If we divide 15 by 15, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 81.0
The remainder is 0 after subtracting 15 from 15.
Include the next digit (7) from the dividend after 0, then repeat: 7 / 15

Let's proceed to step 5:
When dividing 7 by 15, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 810.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 15

Advancing to step 6:
If we divide 75 by 15, we get 5 and a remainder of 0.
The next digit of our result is 5. 
Result so far: 8105.0
Subtract 75 from 75 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.

Moving on to step 7:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8105.0
Deduct 0 from 0 and we're left 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:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8105.0
Deduct 0 from 0 and we're left 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.

After the division, we end up with 8105.0 and a remainder of 0.0.