85644551 divided by 800 
We're looking to find how many times 800 goes into 85644551.

On to step 1:
When dividing 8 by 800, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 800

Moving on to step 2:
800 goes into 85 0 times with a remainder of 85.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 85, we get 85.
Take the next digit (6) from the dividend and append it to 85, then repeat: 856 / 800

Let's proceed to step 3:
800 goes into 856 1 times with a remainder of 56.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 56 after subtracting 800 from 856.
Take the next digit (4) from the dividend and append it to 56, then repeat: 564 / 800

On to step 4:
564 divided by 800 is 0 with a remainder of 564.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 564 after subtracting 0 from 564.
Take the next digit (4) from the dividend and append it to 564, then repeat: 5644 / 800

Step 5:
5644 divided by 800 is 7 with a remainder of 44.
Use 7 as the next digit of our solution. 
Result so far: 107.0
Deduct 5600 from 5644 and we're left with 44.
Include the next digit (5) from the dividend after 44, then repeat: 445 / 800

On to step 6:
The number 800 fits into 445 0 times, leaving a remainder of 445.
Use 0 as the next digit of our solution. 
Result so far: 1070.0
Subtract 0 from 445 to get 445.
Bring next digit (5) of the dividend behind the 445 and repeat the process: 4455 / 800

Moving on to step 7:
4455 divided by 800 is 5 with a remainder of 455.
The number 5 becomes the next digit in our result. 
Result so far: 10705.0
If we take 4000 away from 4455, we end up with 455.
Append the next digit (1) from the dividend to 455 and continue with: 4551 / 800

Step 8:
If we divide 4551 by 800, we get 5 and a remainder of 551.
Put 5 as the next digit of the answer. 
Result so far: 107055.0
If we subtract 4000 from 4551, we get 551.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5510, and continue the process.

Moving on to step 9:
When dividing 5510 by 800, we get 6 with a remainder of 710.
The number 6 becomes the next digit in our result. 
Result so far: 107055.6
Deduct 4800 from 5510 and we're left with 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

On to step 10:
7100 divided by 800 is 8 with a remainder of 700.
Put 8 as the next digit of the answer. 
Result so far: 107055.68
Subtract 6400 from 7100 to get 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Let's proceed to step 11:
If we divide 7000 by 800, we get 8 and a remainder of 600.
The next digit of our result is 8. 
Result so far: 107055.688
If we take 6400 away from 7000, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

The final result is 107055.688 with a remainder of 0.06.