We divide 86816015 by 991
We want to figure out the number of times 86816015 can be divided by 991.

Let's proceed to step 1:
991 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 991

Step 2:
991 goes into 86 0 times with a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Grab the next digit (8) from the dividend, add it to 86, then carry on: 868 / 991

Moving on to step 3:
The number 991 fits into 868 0 times, leaving a remainder of 868.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 868 after subtracting 0 from 868.
Fetch the next digit (1) from the dividend, attach it to 868 and continue: 8681 / 991

Let's proceed to step 4:
When dividing 8681 by 991, we get 8 with a remainder of 753.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtract 7928 from 8681 to get 753.
Grab the next digit (6) from the dividend, add it to 753, then carry on: 7536 / 991

Going ahead to step 5:
The number 991 fits into 7536 7 times, leaving a remainder of 599.
The number 7 becomes the next digit in our result. 
Result so far: 87.0
Subtracting 6937 from 7536 leaves us with 599.
Grab the next digit (0) from the dividend, add it to 599, then carry on: 5990 / 991

Advancing to step 6:
991 goes into 5990 6 times with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 876.0
Deduct 5946 from 5990 and we're left with 44.
Grab the next digit (1) from the dividend, add it to 44, then carry on: 441 / 991

Going ahead to step 7:
991 can be fit into 441 0 times, resulting in a remainder of 441.
The number 0 becomes the next digit in our result. 
Result so far: 8760.0
Deduct 0 from 441 and we're left with 441.
Append the next digit (5) from the dividend to 441 and continue with: 4415 / 991

Let's proceed to step 8:
4415 divided by 991 is 4 with a remainder of 451.
Write down 4 as next digit of the result. 
Result so far: 87604.0
Subtract 3964 from 4415 to get 451.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4510, and continue the process.

On to step 9:
991 can be fit into 4510 4 times, resulting in a remainder of 546.
Put 4 as the next digit of the answer. 
Result so far: 87604.4
The remainder is 546 after subtracting 3964 from 4510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Let's proceed to step 10:
If we divide 5460 by 991, we get 5 and a remainder of 505.
The number 5 becomes the next digit in our result. 
Result so far: 87604.45
Deduct 4955 from 5460 and we're left with 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Let's proceed to step 11:
The number 991 fits into 5050 5 times, leaving a remainder of 95.
Record the quotient 5 as the next digit in the result. 
Result so far: 87604.455
The remainder is 95 after subtracting 4955 from 5050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

The final outcome is 87604.455, with a leftover of 0.0095.