639837 ÷ 45 
Our goal is to divide 639837 by 45.

Moving on to step 1:
6 divided by 45 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 45

Going ahead to step 2:
45 goes into 63 1 times with a remainder of 18.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 45 from 63, we get 18.
Grab the next digit (9) from the dividend, add it to 18, then carry on: 189 / 45

Going ahead to step 3:
45 can be fit into 189 4 times, resulting in a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 14.0
If we take 180 away from 189, we end up with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 45

Moving on to step 4:
45 can be fit into 98 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 142.0
Subtracting 90 from 98 leaves us with 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 45

Let's proceed to step 5:
45 goes into 83 1 times with a remainder of 38.
The next digit of our result is 1. 
Result so far: 1421.0
If we take 45 away from 83, we end up with 38.
Grab the next digit (7) from the dividend, add it to 38, then carry on: 387 / 45

Advancing to step 6:
45 goes into 387 8 times with a remainder of 27.
Use 8 as the next digit of our solution. 
Result so far: 14218.0
Subtracting 360 from 387 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 7:
270 divided by 45 is 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 14218.6
The remainder is 0 after subtracting 270 from 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
45 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 14218.6
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
45 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 14218.6
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 14218.6 with a remainder of 0.0.