645370 divided by 80 
We want to divide 645370 by 80.

Step 1:
The number 80 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 80

Let's proceed to step 2:
If we divide 64 by 80, we get 0 and a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Append the next digit (5) from the dividend to 64 and continue with: 645 / 80

Advancing to step 3:
80 can be fit into 645 8 times, resulting in a remainder of 5.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 640 from 645 to get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 80

On to step 4:
80 can be fit into 53 0 times, resulting in a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 80.0
Deduct 0 from 53 and we're left with 53.
Append the next digit (7) from the dividend to 53 and continue with: 537 / 80

Let's proceed to step 5:
80 can be fit into 537 6 times, resulting in a remainder of 57.
Write down 6 as next digit of the result. 
Result so far: 806.0
If we subtract 480 from 537, we get 57.
Include the next digit (0) from the dividend after 57, then repeat: 570 / 80

Going ahead to step 6:
570 divided by 80 is 7 with a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 8067.0
Deduct 560 from 570 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
If we divide 100 by 80, we get 1 and a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 8067.1
Subtracting 80 from 100 leaves us 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.

On to step 8:
If we divide 200 by 80, we get 2 and a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 8067.12
Subtract 160 from 200 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.

On to step 9:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 8067.125
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
If we divide 0 by 80, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8067.125
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.

Going ahead to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8067.125
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.

In conclusion, the division gives 8067.125 with a balance of 0.0.