99380369 ÷ 648 
We're looking to find how many times 648 goes into 99380369.

Moving on to step 1:
If we divide 9 by 648, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 648

Step 2:
If we divide 99 by 648, we get 0 and a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 99, we end up with 99.
Bring next digit (3) of the dividend behind the 99 and repeat the process: 993 / 648

On to step 3:
993 divided by 648 is 1 with a remainder of 345.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 648 from 993, we get 345.
Take the next digit (8) from the dividend and append it to 345, then repeat: 3458 / 648

Going ahead to step 4:
The number 648 fits into 3458 5 times, leaving a remainder of 218.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Deduct 3240 from 3458 and we're left with 218.
Bring next digit (0) of the dividend behind the 218 and repeat the process: 2180 / 648

Moving on to step 5:
648 can be fit into 2180 3 times, resulting in a remainder of 236.
Write down 3 as next digit of the result. 
Result so far: 153.0
If we take 1944 away from 2180, we end up with 236.
Append the next digit (3) from the dividend to 236 and continue with: 2363 / 648

Let's proceed to step 6:
When dividing 2363 by 648, we get 3 with a remainder of 419.
The next digit of our result is 3. 
Result so far: 1533.0
If we take 1944 away from 2363, we end up with 419.
Take the next digit (6) from the dividend and append it to 419, then repeat: 4196 / 648

Moving on to step 7:
648 goes into 4196 6 times with a remainder of 308.
Use 6 as the next digit of our solution. 
Result so far: 15336.0
If we subtract 3888 from 4196, we get 308.
Grab the next digit (9) from the dividend, add it to 308, then carry on: 3089 / 648

Moving on to step 8:
If we divide 3089 by 648, we get 4 and a remainder of 497.
The number 4 becomes the next digit in our result. 
Result so far: 153364.0
The remainder is 497 after subtracting 2592 from 3089.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

On to step 9:
If we divide 4970 by 648, we get 7 and a remainder of 434.
Put 7 as the next digit of the answer. 
Result so far: 153364.7
The remainder is 434 after subtracting 4536 from 4970.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4340, and continue the process.

Going ahead to step 10:
If we divide 4340 by 648, we get 6 and a remainder of 452.
The next digit of our result is 6. 
Result so far: 153364.76
The remainder is 452 after subtracting 3888 from 4340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Let's proceed to step 11:
4520 divided by 648 is 6 with a remainder of 632.
Record the quotient 6 as the next digit in the result. 
Result so far: 153364.766
Subtract 3888 from 4520 to get 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

The final outcome is 153364.766, with a leftover of 0.0632.