We divide 450213 by 15
We want to figure out the number of times 450213 can be divided by 15.

On to step 1:
15 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 15

Going ahead to step 2:
When dividing 45 by 15, we get 3 with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 45 from 45, we get 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 15

Going ahead to step 3:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 30.0
Subtract 0 from 0 to get 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 15

Moving on to step 4:
15 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 300.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 15

Step 5:
If we divide 21 by 15, we get 1 and a remainder of 6.
The next digit of our result is 1. 
Result so far: 3001.0
If we take 15 away from 21, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 15

Moving on to step 6:
63 divided by 15 is 4 with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 30014.0
Deduct 60 from 63 and we're left 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.

On to step 7:
15 can be fit into 30 2 times, resulting in a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 30014.2
Deduct 30 from 30 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.

Moving on to step 8:
15 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 30014.2
If we subtract 0 from 0, we 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 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 30014.2
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.

The final outcome is 30014.2, with a leftover of 0.0.