We look at the division of 210351 by 15 
We want to divide 210351 by 15.

On to step 1:
If we divide 2 by 15, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 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
If we subtract 15 from 21, we get 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 15

Going ahead to step 3:
15 can be fit into 60 4 times, resulting in a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
The remainder is 0 after subtracting 60 from 60.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 15

On to step 4:
If we divide 3 by 15, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 140.0
If we subtract 0 from 3, we get 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 15

Step 5:
When dividing 35 by 15, we get 2 with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 1402.0
If we subtract 30 from 35, we get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 15

On to step 6:
51 divided by 15 is 3 with a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 14023.0
Deduct 45 from 51 and we're left 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.

Going ahead to step 7:
15 can be fit into 60 4 times, resulting in a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 14023.4
The remainder is 0 after subtracting 60 from 60.
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 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 14023.4
If we take 0 away from 0, we end up 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.

Going ahead to step 9:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 14023.4
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.

The final result is 14023.4 with a remainder of 0.0.