44720820 ÷ 639 
We want to divide 44720820 by 639.

Step 1:
When dividing 4 by 639, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 639

Going ahead to step 2:
If we divide 44 by 639, we get 0 and a remainder of 44.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 44, we end up with 44.
Take the next digit (7) from the dividend and append it to 44, then repeat: 447 / 639

Moving on to step 3:
If we divide 447 by 639, we get 0 and a remainder of 447.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 447 after subtracting 0 from 447.
Include the next digit (2) from the dividend after 447, then repeat: 4472 / 639

On to step 4:
639 goes into 4472 6 times with a remainder of 638.
The next digit of our result is 6. 
Result so far: 6.0
If we take 3834 away from 4472, we end up with 638.
Grab the next digit (0) from the dividend, add it to 638, then carry on: 6380 / 639

Moving on to step 5:
The number 639 fits into 6380 9 times, leaving a remainder of 629.
Put 9 as the next digit of the answer. 
Result so far: 69.0
Deduct 5751 from 6380 and we're left with 629.
Include the next digit (8) from the dividend after 629, then repeat: 6298 / 639

On to step 6:
The number 639 fits into 6298 9 times, leaving a remainder of 547.
Put 9 as the next digit of the answer. 
Result so far: 699.0
Deduct 5751 from 6298 and we're left with 547.
Grab the next digit (2) from the dividend, add it to 547, then carry on: 5472 / 639

Let's proceed to step 7:
The number 639 fits into 5472 8 times, leaving a remainder of 360.
The next digit of our result is 8. 
Result so far: 6998.0
Subtracting 5112 from 5472 leaves us with 360.
Take the next digit (0) from the dividend and append it to 360, then repeat: 3600 / 639

Step 8:
639 can be fit into 3600 5 times, resulting in a remainder of 405.
Use 5 as the next digit of our solution. 
Result so far: 69985.0
Deduct 3195 from 3600 and we're left with 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Step 9:
If we divide 4050 by 639, we get 6 and a remainder of 216.
Use 6 as the next digit of our solution. 
Result so far: 69985.6
Deduct 3834 from 4050 and we're left with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Let's proceed to step 10:
639 can be fit into 2160 3 times, resulting in a remainder of 243.
Record the quotient 3 as the next digit in the result. 
Result so far: 69985.63
Deduct 1917 from 2160 and we're left with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Let's proceed to step 11:
639 goes into 2430 3 times with a remainder of 513.
Write down 3 as next digit of the result. 
Result so far: 69985.633
Subtracting 1917 from 2430 leaves us with 513.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5130, and continue the process.

Our division results in 69985.633 with a remaining 0.0513.