We're dividing 813303 by 15 
We're looking to find how many times 15 goes into 813303.

On to step 1:
8 divided by 15 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 15

Going ahead to step 2:
The number 15 fits into 81 5 times, leaving a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 75 from 81 leaves us with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 15

On to step 3:
15 can be fit into 63 4 times, resulting in a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 54.0
If we take 60 away from 63, we end up with 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 15

Let's proceed to step 4:
If we divide 33 by 15, we get 2 and a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 542.0
Subtract 30 from 33 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 15

Step 5:
If we divide 30 by 15, we get 2 and a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 5422.0
Subtracting 30 from 30 leaves us with 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 15

Let's proceed to step 6:
The number 15 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 54220.0
Subtracting 0 from 3 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
The number 15 fits into 30 2 times, leaving a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 54220.2
Subtracting 30 from 30 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.

Advancing to step 8:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 54220.2
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.

Let's proceed 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: 54220.2
The remainder is 0 after subtracting 0 from 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 outcome is 54220.2, with a leftover of 0.0.