We look at the division of 99870008 by 399 
Let's see how many times 399 fits into 99870008.

Moving on to step 1:
399 goes into 9 0 times with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 399

Moving on to step 2:
If we divide 99 by 399, we get 0 and a remainder of 99.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 99 to get 99.
Append the next digit (8) from the dividend to 99 and continue with: 998 / 399

On to step 3:
The number 399 fits into 998 2 times, leaving a remainder of 200.
The next digit of our result is 2. 
Result so far: 2.0
If we take 798 away from 998, we end up with 200.
Include the next digit (7) from the dividend after 200, then repeat: 2007 / 399

Step 4:
399 can be fit into 2007 5 times, resulting in a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
Subtract 1995 from 2007 to get 12.
Bring next digit (0) of the dividend behind the 12 and repeat the process: 120 / 399

Step 5:
399 goes into 120 0 times with a remainder of 120.
Write down 0 as next digit of the result. 
Result so far: 250.0
The remainder is 120 after subtracting 0 from 120.
Append the next digit (0) from the dividend to 120 and continue with: 1200 / 399

Going ahead to step 6:
1200 divided by 399 is 3 with a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 2503.0
Subtract 1197 from 1200 to get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 399

Let's proceed to step 7:
399 goes into 30 0 times with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 25030.0
Subtract 0 from 30 to get 30.
Append the next digit (8) from the dividend to 30 and continue with: 308 / 399

Going ahead to step 8:
The number 399 fits into 308 0 times, leaving a remainder of 308.
The number 0 becomes the next digit in our result. 
Result so far: 250300.0
Subtract 0 from 308 to get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Step 9:
When dividing 3080 by 399, we get 7 with a remainder of 287.
Use 7 as the next digit of our solution. 
Result so far: 250300.7
Deduct 2793 from 3080 and we're left with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Going ahead to step 10:
399 can be fit into 2870 7 times, resulting in a remainder of 77.
Write down 7 as next digit of the result. 
Result so far: 250300.77
Deduct 2793 from 2870 and we're left with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

The final outcome is 250300.77, with a leftover of 0.077.