We divide 78510043 by 800
Let's see how many times 800 fits into 78510043.

Step 1:
The number 800 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 800

Step 2:
The number 800 fits into 78 0 times, leaving a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Bring next digit (5) of the dividend behind the 78 and repeat the process: 785 / 800

Advancing to step 3:
800 can be fit into 785 0 times, resulting in a remainder of 785.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 785 to get 785.
Append the next digit (1) from the dividend to 785 and continue with: 7851 / 800

Going ahead to step 4:
800 goes into 7851 9 times with a remainder of 651.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 7200 from 7851 and we're left with 651.
Take the next digit (0) from the dividend and append it to 651, then repeat: 6510 / 800

Moving on to step 5:
800 can be fit into 6510 8 times, resulting in a remainder of 110.
Put 8 as the next digit of the answer. 
Result so far: 98.0
The remainder is 110 after subtracting 6400 from 6510.
Take the next digit (0) from the dividend and append it to 110, then repeat: 1100 / 800

Step 6:
800 goes into 1100 1 times with a remainder of 300.
Record the quotient 1 as the next digit in the result. 
Result so far: 981.0
Deduct 800 from 1100 and we're left with 300.
Fetch the next digit (4) from the dividend, attach it to 300 and continue: 3004 / 800

Advancing to step 7:
The number 800 fits into 3004 3 times, leaving a remainder of 604.
The next digit of our result is 3. 
Result so far: 9813.0
The remainder is 604 after subtracting 2400 from 3004.
Fetch the next digit (3) from the dividend, attach it to 604 and continue: 6043 / 800

Step 8:
The number 800 fits into 6043 7 times, leaving a remainder of 443.
The next digit of our result is 7. 
Result so far: 98137.0
Subtracting 5600 from 6043 leaves us with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Advancing to step 9:
When dividing 4430 by 800, we get 5 with a remainder of 430.
Write down 5 as next digit of the result. 
Result so far: 98137.5
Deduct 4000 from 4430 and we're left with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Going ahead to step 10:
The number 800 fits into 4300 5 times, leaving a remainder of 300.
Write down 5 as next digit of the result. 
Result so far: 98137.55
Subtracting 4000 from 4300 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The final outcome is 98137.55, with a leftover of 0.3.