We look at the division of 638780 by 15 
Our goal is to divide 638780 by 15.

Step 1:
15 can be fit into 6 0 times, resulting in a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 15

Moving on to step 2:
15 goes into 63 4 times with a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 60 from 63, we get 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 15

Going ahead to step 3:
The number 15 fits into 38 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 42.0
If we take 30 away from 38, we end up with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 15

Let's proceed to step 4:
The number 15 fits into 87 5 times, leaving a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 425.0
Subtract 75 from 87 to get 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 15

Let's proceed to step 5:
If we divide 128 by 15, we get 8 and a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 4258.0
If we take 120 away from 128, we end up with 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 15

Going ahead to step 6:
15 can be fit into 80 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 42585.0
If we take 75 away from 80, 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.

Step 7:
When dividing 50 by 15, we get 3 with a remainder of 5.
The next digit of our result is 3. 
Result so far: 42585.3
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.

Let's proceed to step 8:
15 goes into 50 3 times with a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 42585.33
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.

Our division results in 42585.33 with a remaining 0.005.