644442 ÷ 80 
We want to figure out the number of times 644442 can be divided by 80.

Moving on to step 1:
When dividing 6 by 80, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 80

Going ahead to step 2:
The number 80 fits into 64 0 times, leaving a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Include the next digit (4) from the dividend after 64, then repeat: 644 / 80

Going ahead to step 3:
The number 80 fits into 644 8 times, leaving a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtracting 640 from 644 leaves us with 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 80

Advancing to step 4:
If we divide 44 by 80, we get 0 and a remainder of 44.
The next digit of our result is 0. 
Result so far: 80.0
The remainder is 44 after subtracting 0 from 44.
Grab the next digit (4) from the dividend, add it to 44, then carry on: 444 / 80

Advancing to step 5:
The number 80 fits into 444 5 times, leaving a remainder of 44.
The number 5 becomes the next digit in our result. 
Result so far: 805.0
The remainder is 44 after subtracting 400 from 444.
Bring next digit (2) of the dividend behind the 44 and repeat the process: 442 / 80

Step 6:
The number 80 fits into 442 5 times, leaving a remainder of 42.
The next digit of our result is 5. 
Result so far: 8055.0
Subtract 400 from 442 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 7:
The number 80 fits into 420 5 times, leaving a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 8055.5
Deduct 400 from 420 and we're left with 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 8:
80 goes into 200 2 times with a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 8055.52
The remainder is 40 after subtracting 160 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 9:
80 goes into 400 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 8055.525
Deduct 400 from 400 and we're left 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 10:
80 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8055.525
Deduct 0 from 0 and we're left 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 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8055.525
Deduct 0 from 0 and we're left 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.

Our division results in 8055.525 with a remaining 0.0.