We divide 646104 by 15
We want to divide 646104 by 15.

Advancing to step 1:
15 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 15

Step 2:
15 goes into 64 4 times with a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 4 after subtracting 60 from 64.
Bring next digit (6) of the dividend behind the 4 and repeat the process: 46 / 15

Moving on to step 3:
15 goes into 46 3 times with a remainder of 1.
The next digit of our result is 3. 
Result so far: 43.0
Subtracting 45 from 46 leaves us with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 15

Going ahead to step 4:
15 goes into 11 0 times with a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 430.0
Deduct 0 from 11 and we're left with 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 15

Going ahead to step 5:
If we divide 110 by 15, we get 7 and a remainder of 5.
Use 7 as the next digit of our solution. 
Result so far: 4307.0
Subtract 105 from 110 to get 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 15

Going ahead to step 6:
15 can be fit into 54 3 times, resulting in a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 43073.0
If we take 45 away from 54, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
90 divided by 15 is 6 with a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 43073.6
If we take 90 away from 90, 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.

Let's proceed to step 8:
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: 43073.6
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.

On to step 9:
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: 43073.6
Deduct 0 from 0 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.

The quotient of the division is 43073.6, and the remainder is 0.0.