We divide 644502 by 80
We want to figure out the number of times 644502 can be divided by 80.

Step 1:
The number 80 fits into 6 0 times, leaving 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.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 80

On to step 2:
If we divide 64 by 80, we get 0 and 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.
Take the next digit (4) from the dividend and append it to 64, then repeat: 644 / 80

On to step 3:
80 can be fit into 644 8 times, resulting in a remainder of 4.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 640 from 644 and we're left with 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 80

Going ahead to step 4:
80 can be fit into 45 0 times, resulting in a remainder of 45.
The next digit of our result is 0. 
Result so far: 80.0
The remainder is 45 after subtracting 0 from 45.
Append the next digit (0) from the dividend to 45 and continue with: 450 / 80

Moving on to step 5:
The number 80 fits into 450 5 times, leaving a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 805.0
Subtracting 400 from 450 leaves us with 50.
Fetch the next digit (2) from the dividend, attach it to 50 and continue: 502 / 80

Let's proceed to step 6:
The number 80 fits into 502 6 times, leaving a remainder of 22.
Put 6 as the next digit of the answer. 
Result so far: 8056.0
Subtracting 480 from 502 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 7:
If we divide 220 by 80, we get 2 and a remainder of 60.
Use 2 as the next digit of our solution. 
Result so far: 8056.2
The remainder is 60 after subtracting 160 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 8:
If we divide 600 by 80, we get 7 and a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 8056.27
Subtract 560 from 600 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 9:
400 divided by 80 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 8056.275
Subtracting 400 from 400 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.

Let's proceed to step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8056.275
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 11:
80 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8056.275
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 8056.275 and a remainder of 0.0.