We're dividing 8390847 by 800 
Let's see how many times 800 fits into 8390847.

Going ahead to step 1:
If we divide 8 by 800, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 800

On to step 2:
The number 800 fits into 83 0 times, leaving a remainder of 83.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 83 to get 83.
Append the next digit (9) from the dividend to 83 and continue with: 839 / 800

Advancing to step 3:
839 divided by 800 is 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 800 from 839 leaves us with 39.
Include the next digit (0) from the dividend after 39, then repeat: 390 / 800

Step 4:
If we divide 390 by 800, we get 0 and a remainder of 390.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 390 leaves us with 390.
Take the next digit (8) from the dividend and append it to 390, then repeat: 3908 / 800

Moving on to step 5:
800 can be fit into 3908 4 times, resulting in a remainder of 708.
The next digit of our result is 4. 
Result so far: 104.0
Subtracting 3200 from 3908 leaves us with 708.
Take the next digit (4) from the dividend and append it to 708, then repeat: 7084 / 800

Step 6:
7084 divided by 800 is 8 with a remainder of 684.
Record the quotient 8 as the next digit in the result. 
Result so far: 1048.0
Deduct 6400 from 7084 and we're left with 684.
Take the next digit (7) from the dividend and append it to 684, then repeat: 6847 / 800

Step 7:
6847 divided by 800 is 8 with a remainder of 447.
Use 8 as the next digit of our solution. 
Result so far: 10488.0
If we take 6400 away from 6847, we end up with 447.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4470, and continue the process.

On to step 8:
When dividing 4470 by 800, we get 5 with a remainder of 470.
The number 5 becomes the next digit in our result. 
Result so far: 10488.5
If we subtract 4000 from 4470, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Advancing to step 9:
4700 divided by 800 is 5 with a remainder of 700.
Record the quotient 5 as the next digit in the result. 
Result so far: 10488.55
The remainder is 700 after subtracting 4000 from 4700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Our division results in 10488.55 with a remaining 0.7.