Let's divide 639264 by 80
We want to divide 639264 by 80.

On to step 1:
When dividing 6 by 80, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 80

Moving on to step 2:
If we divide 63 by 80, we get 0 and a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Append the next digit (9) from the dividend to 63 and continue with: 639 / 80

Moving on to step 3:
If we divide 639 by 80, we get 7 and a remainder of 79.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Deduct 560 from 639 and we're left with 79.
Grab the next digit (2) from the dividend, add it to 79, then carry on: 792 / 80

Going ahead to step 4:
80 can be fit into 792 9 times, resulting in a remainder of 72.
The number 9 becomes the next digit in our result. 
Result so far: 79.0
Deduct 720 from 792 and we're left with 72.
Take the next digit (6) from the dividend and append it to 72, then repeat: 726 / 80

Going ahead to step 5:
When dividing 726 by 80, we get 9 with a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 799.0
If we take 720 away from 726, we end up with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 80

Moving on to step 6:
When dividing 64 by 80, we get 0 with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 7990.0
If we take 0 away from 64, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 7:
80 goes into 640 8 times with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 7990.8
Subtract 640 from 640 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 7990.8
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.

On to step 9:
80 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7990.8
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 7990.8 with a remaining 0.0.