90350254 ÷ 991 
We want to figure out the number of times 90350254 can be divided by 991.

On to step 1:
9 divided by 991 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 991

Advancing to step 2:
90 divided by 991 is 0 with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Grab the next digit (3) from the dividend, add it to 90, then carry on: 903 / 991

Let's proceed to step 3:
If we divide 903 by 991, we get 0 and a remainder of 903.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 903 and we're left with 903.
Include the next digit (5) from the dividend after 903, then repeat: 9035 / 991

Moving on to step 4:
When dividing 9035 by 991, we get 9 with a remainder of 116.
Write down 9 as next digit of the result. 
Result so far: 9.0
The remainder is 116 after subtracting 8919 from 9035.
Take the next digit (0) from the dividend and append it to 116, then repeat: 1160 / 991

Going ahead to step 5:
991 goes into 1160 1 times with a remainder of 169.
Write down 1 as next digit of the result. 
Result so far: 91.0
If we take 991 away from 1160, we end up with 169.
Fetch the next digit (2) from the dividend, attach it to 169 and continue: 1692 / 991

Going ahead to step 6:
The number 991 fits into 1692 1 times, leaving a remainder of 701.
Put 1 as the next digit of the answer. 
Result so far: 911.0
If we take 991 away from 1692, we end up with 701.
Grab the next digit (5) from the dividend, add it to 701, then carry on: 7015 / 991

Step 7:
991 goes into 7015 7 times with a remainder of 78.
Write down 7 as next digit of the result. 
Result so far: 9117.0
Subtracting 6937 from 7015 leaves us with 78.
Include the next digit (4) from the dividend after 78, then repeat: 784 / 991

Moving on to step 8:
991 can be fit into 784 0 times, resulting in a remainder of 784.
Write down 0 as next digit of the result. 
Result so far: 91170.0
The remainder is 784 after subtracting 0 from 784.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Step 9:
7840 divided by 991 is 7 with a remainder of 903.
Record the quotient 7 as the next digit in the result. 
Result so far: 91170.7
Subtract 6937 from 7840 to get 903.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9030, and continue the process.

Let's proceed to step 10:
9030 divided by 991 is 9 with a remainder of 111.
Record the quotient 9 as the next digit in the result. 
Result so far: 91170.79
Deduct 8919 from 9030 and we're left with 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Let's proceed to step 11:
If we divide 1110 by 991, we get 1 and a remainder of 119.
Record the quotient 1 as the next digit in the result. 
Result so far: 91170.791
If we subtract 991 from 1110, we get 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Going ahead to step 12:
991 goes into 1190 1 times with a remainder of 199.
Record the quotient 1 as the next digit in the result. 
Result so far: 91170.7911
If we take 991 away from 1190, we end up with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

The final result is 91170.7911 with a remainder of 0.00199.