We're dividing 81993648 by 915 
We want to figure out the number of times 81993648 can be divided by 915.

Advancing to step 1:
When dividing 8 by 915, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 915

Moving on to step 2:
915 can be fit into 81 0 times, resulting in a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Fetch the next digit (9) from the dividend, attach it to 81 and continue: 819 / 915

Going ahead to step 3:
The number 915 fits into 819 0 times, leaving a remainder of 819.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 819 and we're left with 819.
Include the next digit (9) from the dividend after 819, then repeat: 8199 / 915

Step 4:
915 can be fit into 8199 8 times, resulting in a remainder of 879.
The next digit of our result is 8. 
Result so far: 8.0
If we take 7320 away from 8199, we end up with 879.
Grab the next digit (3) from the dividend, add it to 879, then carry on: 8793 / 915

Going ahead to step 5:
If we divide 8793 by 915, we get 9 and a remainder of 558.
The number 9 becomes the next digit in our result. 
Result so far: 89.0
Subtracting 8235 from 8793 leaves us with 558.
Bring next digit (6) of the dividend behind the 558 and repeat the process: 5586 / 915

Going ahead to step 6:
915 goes into 5586 6 times with a remainder of 96.
Record the quotient 6 as the next digit in the result. 
Result so far: 896.0
The remainder is 96 after subtracting 5490 from 5586.
Append the next digit (4) from the dividend to 96 and continue with: 964 / 915

Step 7:
When dividing 964 by 915, we get 1 with a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 8961.0
If we take 915 away from 964, we end up with 49.
Fetch the next digit (8) from the dividend, attach it to 49 and continue: 498 / 915

Going ahead to step 8:
When dividing 498 by 915, we get 0 with a remainder of 498.
The number 0 becomes the next digit in our result. 
Result so far: 89610.0
If we take 0 away from 498, we end up with 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Let's proceed to step 9:
When dividing 4980 by 915, we get 5 with a remainder of 405.
Use 5 as the next digit of our solution. 
Result so far: 89610.5
Subtracting 4575 from 4980 leaves us with 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Going ahead to step 10:
The number 915 fits into 4050 4 times, leaving a remainder of 390.
Put 4 as the next digit of the answer. 
Result so far: 89610.54
If we subtract 3660 from 4050, we get 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Going ahead to step 11:
915 goes into 3900 4 times with a remainder of 240.
Write down 4 as next digit of the result. 
Result so far: 89610.544
Deduct 3660 from 3900 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

After the division, we end up with 89610.544 and a remainder of 0.024.