Let's divide 639571 by 42
Our goal is to divide 639571 by 42.

Let's proceed to step 1:
If we divide 6 by 42, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 42

Advancing to step 2:
The number 42 fits into 63 1 times, leaving a remainder of 21.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 42 from 63 to get 21.
Append the next digit (9) from the dividend to 21 and continue with: 219 / 42

Advancing to step 3:
The number 42 fits into 219 5 times, leaving a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we take 210 away from 219, we end up with 9.
Append the next digit (5) from the dividend to 9 and continue with: 95 / 42

Advancing to step 4:
The number 42 fits into 95 2 times, leaving a remainder of 11.
Put 2 as the next digit of the answer. 
Result so far: 152.0
Subtracting 84 from 95 leaves us with 11.
Fetch the next digit (7) from the dividend, attach it to 11 and continue: 117 / 42

Step 5:
The number 42 fits into 117 2 times, leaving a remainder of 33.
The next digit of our result is 2. 
Result so far: 1522.0
The remainder is 33 after subtracting 84 from 117.
Fetch the next digit (1) from the dividend, attach it to 33 and continue: 331 / 42

Going ahead to step 6:
331 divided by 42 is 7 with a remainder of 37.
Use 7 as the next digit of our solution. 
Result so far: 15227.0
The remainder is 37 after subtracting 294 from 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 7:
370 divided by 42 is 8 with a remainder of 34.
The next digit of our result is 8. 
Result so far: 15227.8
Subtract 336 from 370 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 8:
42 can be fit into 340 8 times, resulting in a remainder of 4.
The next digit of our result is 8. 
Result so far: 15227.88
If we subtract 336 from 340, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Our division results in 15227.88 with a remaining 0.004.