88619086 ÷ 991 
Our goal is to divide 88619086 by 991.

Moving on to step 1:
991 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 991

Moving on to step 2:
991 goes into 88 0 times with a remainder of 88.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 88 and we're left with 88.
Take the next digit (6) from the dividend and append it to 88, then repeat: 886 / 991

Advancing to step 3:
991 can be fit into 886 0 times, resulting in a remainder of 886.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 886 after subtracting 0 from 886.
Include the next digit (1) from the dividend after 886, then repeat: 8861 / 991

Step 4:
8861 divided by 991 is 8 with a remainder of 933.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we subtract 7928 from 8861, we get 933.
Grab the next digit (9) from the dividend, add it to 933, then carry on: 9339 / 991

Going ahead to step 5:
991 can be fit into 9339 9 times, resulting in a remainder of 420.
Record the quotient 9 as the next digit in the result. 
Result so far: 89.0
Deduct 8919 from 9339 and we're left with 420.
Grab the next digit (0) from the dividend, add it to 420, then carry on: 4200 / 991

Going ahead to step 6:
The number 991 fits into 4200 4 times, leaving a remainder of 236.
Put 4 as the next digit of the answer. 
Result so far: 894.0
The remainder is 236 after subtracting 3964 from 4200.
Bring next digit (8) of the dividend behind the 236 and repeat the process: 2368 / 991

Step 7:
2368 divided by 991 is 2 with a remainder of 386.
Put 2 as the next digit of the answer. 
Result so far: 8942.0
The remainder is 386 after subtracting 1982 from 2368.
Bring next digit (6) of the dividend behind the 386 and repeat the process: 3866 / 991

Moving on to step 8:
If we divide 3866 by 991, we get 3 and a remainder of 893.
Write down 3 as next digit of the result. 
Result so far: 89423.0
If we subtract 2973 from 3866, we get 893.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8930, and continue the process.

Step 9:
8930 divided by 991 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 89423.9
Subtract 8919 from 8930 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 10:
110 divided by 991 is 0 with a remainder of 110.
The next digit of our result is 0. 
Result so far: 89423.9
The remainder is 110 after subtracting 0 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Step 11:
If we divide 1100 by 991, we get 1 and a remainder of 109.
Put 1 as the next digit of the answer. 
Result so far: 89423.901
If we take 991 away from 1100, we end up with 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Moving on to step 12:
1090 divided by 991 is 1 with a remainder of 99.
The number 1 becomes the next digit in our result. 
Result so far: 89423.9011
If we take 991 away from 1090, we end up with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

After the division, we end up with 89423.9011 and a remainder of 0.00099.