639236 ÷ 42 
We're looking to find how many times 42 goes into 639236.

Step 1:
42 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 42

Moving on to step 2:
63 divided by 42 is 1 with a remainder of 21.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 42 from 63 leaves us with 21.
Append the next digit (9) from the dividend to 21 and continue with: 219 / 42

Moving on to step 3:
If we divide 219 by 42, we get 5 and a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 15.0
The remainder is 9 after subtracting 210 from 219.
Fetch the next digit (2) from the dividend, attach it to 9 and continue: 92 / 42

On to step 4:
42 can be fit into 92 2 times, resulting in a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 152.0
Subtract 84 from 92 to get 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 42

Let's proceed to step 5:
If we divide 83 by 42, we get 1 and a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 1521.0
Subtract 42 from 83 to get 41.
Include the next digit (6) from the dividend after 41, then repeat: 416 / 42

Let's proceed to step 6:
If we divide 416 by 42, we get 9 and a remainder of 38.
Use 9 as the next digit of our solution. 
Result so far: 15219.0
If we take 378 away from 416, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 7:
When dividing 380 by 42, we get 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 15219.9
The remainder is 2 after subtracting 378 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
The number 42 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 15219.9
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 9:
The number 42 fits into 200 4 times, leaving a remainder of 32.
Record the quotient 4 as the next digit in the result. 
Result so far: 15219.904
Subtract 168 from 200 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 10:
The number 42 fits into 320 7 times, leaving a remainder of 26.
Write down 7 as next digit of the result. 
Result so far: 15219.9047
If we subtract 294 from 320, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 11:
260 divided by 42 is 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 15219.90476
The remainder is 8 after subtracting 252 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 12:
If we divide 80 by 42, we get 1 and a remainder of 38.
The next digit of our result is 1. 
Result so far: 15219.904761
If we subtract 42 from 80, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 13:
42 can be fit into 380 9 times, resulting in a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 15219.9047619
Subtract 378 from 380 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 14:
The number 42 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 15219.9047619
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

In conclusion, the division gives 15219.9047619 with a balance of 2e-08.