We look at the division of 99512545 by 408 
We want to divide 99512545 by 408.

On to step 1:
408 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 408

Moving on to step 2:
If we divide 99 by 408, we get 0 and a remainder of 99.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 99 after subtracting 0 from 99.
Grab the next digit (5) from the dividend, add it to 99, then carry on: 995 / 408

Advancing to step 3:
995 divided by 408 is 2 with a remainder of 179.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 816 away from 995, we end up with 179.
Append the next digit (1) from the dividend to 179 and continue with: 1791 / 408

Advancing to step 4:
If we divide 1791 by 408, we get 4 and a remainder of 159.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Subtract 1632 from 1791 to get 159.
Grab the next digit (2) from the dividend, add it to 159, then carry on: 1592 / 408

Let's proceed to step 5:
408 goes into 1592 3 times with a remainder of 368.
Use 3 as the next digit of our solution. 
Result so far: 243.0
If we take 1224 away from 1592, we end up with 368.
Append the next digit (5) from the dividend to 368 and continue with: 3685 / 408

Going ahead to step 6:
When dividing 3685 by 408, we get 9 with a remainder of 13.
The number 9 becomes the next digit in our result. 
Result so far: 2439.0
The remainder is 13 after subtracting 3672 from 3685.
Append the next digit (4) from the dividend to 13 and continue with: 134 / 408

On to step 7:
When dividing 134 by 408, we get 0 with a remainder of 134.
Put 0 as the next digit of the answer. 
Result so far: 24390.0
Subtract 0 from 134 to get 134.
Include the next digit (5) from the dividend after 134, then repeat: 1345 / 408

Let's proceed to step 8:
408 goes into 1345 3 times with a remainder of 121.
Use 3 as the next digit of our solution. 
Result so far: 243903.0
If we subtract 1224 from 1345, we get 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

On to step 9:
When dividing 1210 by 408, we get 2 with a remainder of 394.
Record the quotient 2 as the next digit in the result. 
Result so far: 243903.2
If we take 816 away from 1210, we end up with 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Advancing to step 10:
If we divide 3940 by 408, we get 9 and a remainder of 268.
The next digit of our result is 9. 
Result so far: 243903.29
If we subtract 3672 from 3940, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Advancing to step 11:
If we divide 2680 by 408, we get 6 and a remainder of 232.
Record the quotient 6 as the next digit in the result. 
Result so far: 243903.296
If we subtract 2448 from 2680, we get 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Moving on to step 12:
408 can be fit into 2320 5 times, resulting in a remainder of 280.
The number 5 becomes the next digit in our result. 
Result so far: 243903.2965
If we take 2040 away from 2320, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 13:
408 can be fit into 2800 6 times, resulting in a remainder of 352.
The next digit of our result is 6. 
Result so far: 243903.29656
Subtract 2448 from 2800 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Advancing to step 14:
408 goes into 3520 8 times with a remainder of 256.
The number 8 becomes the next digit in our result. 
Result so far: 243903.296568
If we subtract 3264 from 3520, we get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Moving on to step 15:
The number 408 fits into 2560 6 times, leaving a remainder of 112.
Write down 6 as next digit of the result. 
Result so far: 243903.2965686
Subtracting 2448 from 2560 leaves us with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

On to step 16:
When dividing 1120 by 408, we get 2 with a remainder of 304.
The number 2 becomes the next digit in our result. 
Result so far: 243903.29656862
Deduct 816 from 1120 and we're left with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

The final result is 243903.29656862 with a remainder of 3.04e-07.