80545257 ÷ 999 
We want to figure out the number of times 80545257 can be divided by 999.

On to step 1:
When dividing 8 by 999, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 999

Step 2:
999 can be fit into 80 0 times, resulting in a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Include the next digit (5) from the dividend after 80, then repeat: 805 / 999

On to step 3:
If we divide 805 by 999, we get 0 and a remainder of 805.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 805, we end up with 805.
Grab the next digit (4) from the dividend, add it to 805, then carry on: 8054 / 999

Moving on to step 4:
8054 divided by 999 is 8 with a remainder of 62.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 7992 from 8054, we get 62.
Grab the next digit (5) from the dividend, add it to 62, then carry on: 625 / 999

Advancing to step 5:
When dividing 625 by 999, we get 0 with a remainder of 625.
Put 0 as the next digit of the answer. 
Result so far: 80.0
The remainder is 625 after subtracting 0 from 625.
Grab the next digit (2) from the dividend, add it to 625, then carry on: 6252 / 999

Going ahead to step 6:
6252 divided by 999 is 6 with a remainder of 258.
Use 6 as the next digit of our solution. 
Result so far: 806.0
If we take 5994 away from 6252, we end up with 258.
Take the next digit (5) from the dividend and append it to 258, then repeat: 2585 / 999

Step 7:
2585 divided by 999 is 2 with a remainder of 587.
Put 2 as the next digit of the answer. 
Result so far: 8062.0
Deduct 1998 from 2585 and we're left with 587.
Take the next digit (7) from the dividend and append it to 587, then repeat: 5877 / 999

Let's proceed to step 8:
5877 divided by 999 is 5 with a remainder of 882.
Write down 5 as next digit of the result. 
Result so far: 80625.0
If we subtract 4995 from 5877, we get 882.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8820, and continue the process.

Going ahead to step 9:
The number 999 fits into 8820 8 times, leaving a remainder of 828.
Record the quotient 8 as the next digit in the result. 
Result so far: 80625.8
If we take 7992 away from 8820, we end up with 828.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8280, and continue the process.

Step 10:
999 can be fit into 8280 8 times, resulting in a remainder of 288.
Put 8 as the next digit of the answer. 
Result so far: 80625.88
Subtracting 7992 from 8280 leaves us with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

The quotient of the division is 80625.88, and the remainder is 0.288.