640616 divided by 15 
Let's see how many times 15 fits into 640616.

Advancing to step 1:
The number 15 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 15

On to step 2:
When dividing 64 by 15, we get 4 with a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 4 after subtracting 60 from 64.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 15

Let's proceed to step 3:
40 divided by 15 is 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 42.0
Deduct 30 from 40 and we're left with 10.
Bring next digit (6) of the dividend behind the 10 and repeat the process: 106 / 15

Step 4:
15 goes into 106 7 times with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 427.0
If we take 105 away from 106, we end up with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 15

Advancing to step 5:
If we divide 11 by 15, we get 0 and a remainder of 11.
Use 0 as the next digit of our solution. 
Result so far: 4270.0
If we take 0 away from 11, we end up with 11.
Append the next digit (6) from the dividend to 11 and continue with: 116 / 15

Step 6:
If we divide 116 by 15, we get 7 and a remainder of 11.
The next digit of our result is 7. 
Result so far: 42707.0
Subtracting 105 from 116 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.

Going ahead to step 7:
The number 15 fits into 110 7 times, leaving a remainder of 5.
Put 7 as the next digit of the answer. 
Result so far: 42707.7
Subtract 105 from 110 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.

Step 8:
50 divided by 15 is 3 with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 42707.73
If we take 45 away from 50, 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.

On to step 9:
50 divided by 15 is 3 with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 42707.733
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.

The final outcome is 42707.733, with a leftover of 0.0005.