644668 ÷ 80 
We want to divide 644668 by 80.

On to step 1:
If we divide 6 by 80, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 80

On to step 2:
80 can be fit into 64 0 times, resulting in a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Append the next digit (4) from the dividend to 64 and continue with: 644 / 80

Going ahead to step 3:
80 can be fit into 644 8 times, resulting in a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 640 away from 644, we end up with 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 80

Going ahead to step 4:
When dividing 46 by 80, we get 0 with a remainder of 46.
Put 0 as the next digit of the answer. 
Result so far: 80.0
Subtract 0 from 46 to get 46.
Fetch the next digit (6) from the dividend, attach it to 46 and continue: 466 / 80

Advancing to step 5:
The number 80 fits into 466 5 times, leaving a remainder of 66.
Write down 5 as next digit of the result. 
Result so far: 805.0
Deduct 400 from 466 and we're left with 66.
Include the next digit (8) from the dividend after 66, then repeat: 668 / 80

Going ahead to step 6:
80 can be fit into 668 8 times, resulting in a remainder of 28.
Use 8 as the next digit of our solution. 
Result so far: 8058.0
If we take 640 away from 668, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 7:
If we divide 280 by 80, we get 3 and a remainder of 40.
The number 3 becomes the next digit in our result. 
Result so far: 8058.3
The remainder is 40 after subtracting 240 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 8:
The number 80 fits into 400 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 8058.35
If we take 400 away from 400, 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.

Moving on to step 9:
80 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: 8058.35
If we subtract 0 from 0, we 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.

Step 10:
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: 8058.35
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.

The final result is 8058.35 with a remainder of 0.0.