638570 ÷ 15 
Our goal is to divide 638570 by 15.

Advancing to step 1:
6 divided by 15 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 15

Step 2:
When dividing 63 by 15, we get 4 with a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 60 away from 63, we end up with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 15

Moving on to step 3:
38 divided by 15 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
Subtract 30 from 38 to get 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 15

Moving on to step 4:
The number 15 fits into 85 5 times, leaving a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 425.0
The remainder is 10 after subtracting 75 from 85.
Fetch the next digit (7) from the dividend, attach it to 10 and continue: 107 / 15

Advancing to step 5:
When dividing 107 by 15, we get 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 4257.0
Subtract 105 from 107 to get 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 15

Moving on to step 6:
When dividing 20 by 15, we get 1 with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 42571.0
Subtract 15 from 20 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.

Moving on to step 7:
15 can be fit into 50 3 times, resulting in a remainder of 5.
The next digit of our result is 3. 
Result so far: 42571.3
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 8:
When dividing 50 by 15, we get 3 with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 42571.33
Subtracting 45 from 50 leaves us 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 42571.33 and a remainder of 0.005.