640556 divided by 15 
Our goal is to divide 640556 by 15.

Let's proceed to step 1:
The number 15 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 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.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 15

Let's proceed to step 3:
15 goes into 40 2 times with a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
If we take 30 away from 40, we end up with 10.
Take the next digit (5) from the dividend and append it to 10, then repeat: 105 / 15

Step 4:
The number 15 fits into 105 7 times, leaving a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 427.0
Subtracting 105 from 105 leaves us with 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 15

On to step 5:
15 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 4270.0
Subtract 0 from 5 to get 5.
Bring next digit (6) of the dividend behind the 5 and repeat the process: 56 / 15

Moving on to step 6:
15 can be fit into 56 3 times, resulting in a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 42703.0
If we subtract 45 from 56, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
110 divided by 15 is 7 with a remainder of 5.
Record the quotient 7 as the next digit in the result. 
Result so far: 42703.7
Deduct 105 from 110 and we're left 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.

Let's proceed to step 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 42703.73
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.
The number 3 becomes the next digit in our result. 
Result so far: 42703.733
Deduct 45 from 50 and we're left 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.

After the division, we end up with 42703.733 and a remainder of 0.0005.