We look at the division of 216521 by 15 
We want to divide 216521 by 15.

Step 1:
If we divide 2 by 15, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 15

Moving on to step 2:
If we divide 21 by 15, we get 1 and a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 6 after subtracting 15 from 21.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 15

Going ahead to step 3:
If we divide 66 by 15, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 14.0
The remainder is 6 after subtracting 60 from 66.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 15

Going ahead to step 4:
The number 15 fits into 65 4 times, leaving a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 144.0
Subtracting 60 from 65 leaves us with 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 15

Advancing to step 5:
If we divide 52 by 15, we get 3 and a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 1443.0
Subtracting 45 from 52 leaves us with 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 15

Moving on to step 6:
15 goes into 71 4 times with a remainder of 11.
The next digit of our result is 4. 
Result so far: 14434.0
Subtracting 60 from 71 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
15 can be fit into 110 7 times, resulting in a remainder of 5.
Use 7 as the next digit of our solution. 
Result so far: 14434.7
If we take 105 away from 110, we end up 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.

Going ahead to step 8:
50 divided by 15 is 3 with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 14434.73
Subtract 45 from 50 to 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.

On to step 9:
15 goes into 50 3 times with a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 14434.733
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.

Our division results in 14434.733 with a remaining 0.0005.