We divide 645142 by 80
We want to figure out the number of times 645142 can be divided by 80.

Advancing to step 1:
When dividing 6 by 80, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 80

Let's proceed to step 2:
The number 80 fits into 64 0 times, leaving a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Append the next digit (5) from the dividend to 64 and continue with: 645 / 80

Going ahead to step 3:
80 can be fit into 645 8 times, resulting in a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 5 after subtracting 640 from 645.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 80

Advancing to step 4:
The number 80 fits into 51 0 times, leaving a remainder of 51.
The next digit of our result is 0. 
Result so far: 80.0
Subtracting 0 from 51 leaves us with 51.
Bring next digit (4) of the dividend behind the 51 and repeat the process: 514 / 80

On to step 5:
The number 80 fits into 514 6 times, leaving a remainder of 34.
Put 6 as the next digit of the answer. 
Result so far: 806.0
Subtracting 480 from 514 leaves us with 34.
Append the next digit (2) from the dividend to 34 and continue with: 342 / 80

Going ahead to step 6:
The number 80 fits into 342 4 times, leaving a remainder of 22.
The next digit of our result is 4. 
Result so far: 8064.0
If we subtract 320 from 342, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 7:
220 divided by 80 is 2 with a remainder of 60.
The number 2 becomes the next digit in our result. 
Result so far: 8064.2
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.

Let's proceed to step 8:
The number 80 fits into 600 7 times, leaving a remainder of 40.
Write down 7 as next digit of the result. 
Result so far: 8064.27
The remainder is 40 after subtracting 560 from 600.
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:
If we divide 400 by 80, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 8064.275
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:
If we divide 0 by 80, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 8064.275
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.

Going ahead to step 11:
80 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8064.275
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.

After the division, we end up with 8064.275 and a remainder of 0.0.