We're dividing 253821 by 15 
We're looking to find how many times 15 goes into 253821.

Going ahead to step 1:
If we divide 2 by 15, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 15

Advancing to step 2:
15 goes into 25 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 15 from 25 leaves us with 10.
Append the next digit (3) from the dividend to 10 and continue with: 103 / 15

Let's proceed to step 3:
103 divided by 15 is 6 with a remainder of 13.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtracting 90 from 103 leaves us with 13.
Append the next digit (8) from the dividend to 13 and continue with: 138 / 15

Step 4:
15 can be fit into 138 9 times, resulting in a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 169.0
The remainder is 3 after subtracting 135 from 138.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 15

Step 5:
15 goes into 32 2 times with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 1692.0
Subtract 30 from 32 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 15

Going ahead to step 6:
When dividing 21 by 15, we get 1 with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 16921.0
If we take 15 away from 21, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
15 goes into 60 4 times with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 16921.4
Subtract 60 from 60 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.

On to step 8:
15 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 16921.4
Subtracting 0 from 0 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.

Let's proceed to step 9:
15 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 16921.4
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.

After the division, we end up with 16921.4 and a remainder of 0.0.