We look at the division of 39186720 by 638 
We're looking to find how many times 638 goes into 39186720.

Step 1:
The number 638 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 638

Going ahead to step 2:
When dividing 39 by 638, we get 0 with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (1) from the dividend to 39 and continue with: 391 / 638

On to step 3:
The number 638 fits into 391 0 times, leaving a remainder of 391.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 391 after subtracting 0 from 391.
Fetch the next digit (8) from the dividend, attach it to 391 and continue: 3918 / 638

Advancing to step 4:
If we divide 3918 by 638, we get 6 and a remainder of 90.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we subtract 3828 from 3918, we get 90.
Bring next digit (6) of the dividend behind the 90 and repeat the process: 906 / 638

Step 5:
When dividing 906 by 638, we get 1 with a remainder of 268.
The next digit of our result is 1. 
Result so far: 61.0
Deduct 638 from 906 and we're left with 268.
Take the next digit (7) from the dividend and append it to 268, then repeat: 2687 / 638

Moving on to step 6:
638 goes into 2687 4 times with a remainder of 135.
Write down 4 as next digit of the result. 
Result so far: 614.0
The remainder is 135 after subtracting 2552 from 2687.
Append the next digit (2) from the dividend to 135 and continue with: 1352 / 638

Advancing to step 7:
When dividing 1352 by 638, we get 2 with a remainder of 76.
Use 2 as the next digit of our solution. 
Result so far: 6142.0
Subtracting 1276 from 1352 leaves us with 76.
Bring next digit (0) of the dividend behind the 76 and repeat the process: 760 / 638

Step 8:
The number 638 fits into 760 1 times, leaving a remainder of 122.
Write down 1 as next digit of the result. 
Result so far: 61421.0
Subtracting 638 from 760 leaves us with 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

On to step 9:
If we divide 1220 by 638, we get 1 and a remainder of 582.
Put 1 as the next digit of the answer. 
Result so far: 61421.1
Subtract 638 from 1220 to get 582.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

On to step 10:
If we divide 5820 by 638, we get 9 and a remainder of 78.
The next digit of our result is 9. 
Result so far: 61421.19
Subtract 5742 from 5820 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 11:
780 divided by 638 is 1 with a remainder of 142.
The number 1 becomes the next digit in our result. 
Result so far: 61421.191
Deduct 638 from 780 and we're left with 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Step 12:
1420 divided by 638 is 2 with a remainder of 144.
The number 2 becomes the next digit in our result. 
Result so far: 61421.1912
If we take 1276 away from 1420, we end up with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

On to step 13:
If we divide 1440 by 638, we get 2 and a remainder of 164.
Write down 2 as next digit of the result. 
Result so far: 61421.19122
If we take 1276 away from 1440, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Our division results in 61421.19122 with a remaining 0.000164.