We're dividing 99850086 by 648 
We want to divide 99850086 by 648.

Let's proceed to step 1:
648 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 648

Moving on to step 2:
If we divide 99 by 648, we get 0 and a remainder of 99.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 99 after subtracting 0 from 99.
Grab the next digit (8) from the dividend, add it to 99, then carry on: 998 / 648

Let's proceed to step 3:
648 goes into 998 1 times with a remainder of 350.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 648 from 998 and we're left with 350.
Bring next digit (5) of the dividend behind the 350 and repeat the process: 3505 / 648

Moving on to step 4:
3505 divided by 648 is 5 with a remainder of 265.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Deduct 3240 from 3505 and we're left with 265.
Append the next digit (0) from the dividend to 265 and continue with: 2650 / 648

On to step 5:
648 goes into 2650 4 times with a remainder of 58.
The number 4 becomes the next digit in our result. 
Result so far: 154.0
If we subtract 2592 from 2650, we get 58.
Bring next digit (0) of the dividend behind the 58 and repeat the process: 580 / 648

Step 6:
If we divide 580 by 648, we get 0 and a remainder of 580.
The number 0 becomes the next digit in our result. 
Result so far: 1540.0
The remainder is 580 after subtracting 0 from 580.
Bring next digit (8) of the dividend behind the 580 and repeat the process: 5808 / 648

Moving on to step 7:
When dividing 5808 by 648, we get 8 with a remainder of 624.
Put 8 as the next digit of the answer. 
Result so far: 15408.0
The remainder is 624 after subtracting 5184 from 5808.
Grab the next digit (6) from the dividend, add it to 624, then carry on: 6246 / 648

Let's proceed to step 8:
6246 divided by 648 is 9 with a remainder of 414.
The next digit of our result is 9. 
Result so far: 154089.0
If we subtract 5832 from 6246, we get 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

On to step 9:
The number 648 fits into 4140 6 times, leaving a remainder of 252.
Write down 6 as next digit of the result. 
Result so far: 154089.6
The remainder is 252 after subtracting 3888 from 4140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Step 10:
648 can be fit into 2520 3 times, resulting in a remainder of 576.
The next digit of our result is 3. 
Result so far: 154089.63
Deduct 1944 from 2520 and we're left with 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

On to step 11:
The number 648 fits into 5760 8 times, leaving a remainder of 576.
Put 8 as the next digit of the answer. 
Result so far: 154089.638
If we subtract 5184 from 5760, we get 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

Going ahead to step 12:
5760 divided by 648 is 8 with a remainder of 576.
The next digit of our result is 8. 
Result so far: 154089.6388
If we subtract 5184 from 5760, we get 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

The final result is 154089.6388 with a remainder of 0.00576.