We're dividing 81315137 by 999 
Let's see how many times 999 fits into 81315137.

Step 1:
999 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 999

Step 2:
The number 999 fits into 81 0 times, leaving a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Fetch the next digit (3) from the dividend, attach it to 81 and continue: 813 / 999

Going ahead to step 3:
If we divide 813 by 999, we get 0 and a remainder of 813.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 813, we end up with 813.
Append the next digit (1) from the dividend to 813 and continue with: 8131 / 999

Step 4:
999 can be fit into 8131 8 times, resulting in a remainder of 139.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 7992 from 8131 and we're left with 139.
Bring next digit (5) of the dividend behind the 139 and repeat the process: 1395 / 999

Advancing to step 5:
The number 999 fits into 1395 1 times, leaving a remainder of 396.
The next digit of our result is 1. 
Result so far: 81.0
Subtracting 999 from 1395 leaves us with 396.
Take the next digit (1) from the dividend and append it to 396, then repeat: 3961 / 999

Going ahead to step 6:
If we divide 3961 by 999, we get 3 and a remainder of 964.
Record the quotient 3 as the next digit in the result. 
Result so far: 813.0
If we take 2997 away from 3961, we end up with 964.
Include the next digit (3) from the dividend after 964, then repeat: 9643 / 999

Let's proceed to step 7:
When dividing 9643 by 999, we get 9 with a remainder of 652.
The next digit of our result is 9. 
Result so far: 8139.0
Subtract 8991 from 9643 to get 652.
Take the next digit (7) from the dividend and append it to 652, then repeat: 6527 / 999

Let's proceed to step 8:
999 goes into 6527 6 times with a remainder of 533.
The number 6 becomes the next digit in our result. 
Result so far: 81396.0
If we subtract 5994 from 6527, we get 533.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5330, and continue the process.

Going ahead to step 9:
999 goes into 5330 5 times with a remainder of 335.
Record the quotient 5 as the next digit in the result. 
Result so far: 81396.5
If we subtract 4995 from 5330, we get 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

On to step 10:
3350 divided by 999 is 3 with a remainder of 353.
Write down 3 as next digit of the result. 
Result so far: 81396.53
Subtracting 2997 from 3350 leaves us with 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

Step 11:
The number 999 fits into 3530 3 times, leaving a remainder of 533.
The next digit of our result is 3. 
Result so far: 81396.533
The remainder is 533 after subtracting 2997 from 3530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5330, and continue the process.

The final outcome is 81396.533, with a leftover of 0.0533.