We're dividing 638572 by 15 
We want to figure out the number of times 638572 can be divided by 15.

Let's proceed to step 1:
6 divided by 15 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 15

Going ahead to step 2:
15 goes into 63 4 times with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 60 from 63 leaves us with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 15

Going ahead to step 3:
The number 15 fits into 38 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 42.0
Subtracting 30 from 38 leaves us with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 15

Step 4:
15 goes into 85 5 times with a remainder of 10.
The number 5 becomes the next digit in our 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

Going ahead to step 5:
If we divide 107 by 15, we get 7 and a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 4257.0
If we subtract 105 from 107, we get 2.
Include the next digit (2) from the dividend after 2, then repeat: 22 / 15

Moving on to step 6:
If we divide 22 by 15, we get 1 and a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 42571.0
Deduct 15 from 22 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
The number 15 fits into 70 4 times, leaving a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 42571.4
If we subtract 60 from 70, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
15 goes into 100 6 times with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 42571.46
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 42571.466
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 42571.466, with a leftover of 0.001.