55021859 ÷ 991 
We want to divide 55021859 by 991.

Going ahead to step 1:
991 goes into 5 0 times with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 991

Moving on to step 2:
When dividing 55 by 991, we get 0 with a remainder of 55.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 55 and we're left with 55.
Append the next digit (0) from the dividend to 55 and continue with: 550 / 991

Step 3:
991 goes into 550 0 times with a remainder of 550.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 550, we end up with 550.
Grab the next digit (2) from the dividend, add it to 550, then carry on: 5502 / 991

Step 4:
If we divide 5502 by 991, we get 5 and a remainder of 547.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 4955 away from 5502, we end up with 547.
Grab the next digit (1) from the dividend, add it to 547, then carry on: 5471 / 991

Let's proceed to step 5:
5471 divided by 991 is 5 with a remainder of 516.
Write down 5 as next digit of the result. 
Result so far: 55.0
Subtracting 4955 from 5471 leaves us with 516.
Bring next digit (8) of the dividend behind the 516 and repeat the process: 5168 / 991

Step 6:
If we divide 5168 by 991, we get 5 and a remainder of 213.
Put 5 as the next digit of the answer. 
Result so far: 555.0
Subtracting 4955 from 5168 leaves us with 213.
Bring next digit (5) of the dividend behind the 213 and repeat the process: 2135 / 991

Moving on to step 7:
When dividing 2135 by 991, we get 2 with a remainder of 153.
The number 2 becomes the next digit in our result. 
Result so far: 5552.0
The remainder is 153 after subtracting 1982 from 2135.
Take the next digit (9) from the dividend and append it to 153, then repeat: 1539 / 991

Moving on to step 8:
The number 991 fits into 1539 1 times, leaving a remainder of 548.
Record the quotient 1 as the next digit in the result. 
Result so far: 55521.0
Subtracting 991 from 1539 leaves us with 548.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

Let's proceed to step 9:
5480 divided by 991 is 5 with a remainder of 525.
Record the quotient 5 as the next digit in the result. 
Result so far: 55521.5
The remainder is 525 after subtracting 4955 from 5480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

On to step 10:
991 can be fit into 5250 5 times, resulting in a remainder of 295.
The number 5 becomes the next digit in our result. 
Result so far: 55521.55
Subtract 4955 from 5250 to get 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

The final outcome is 55521.55, with a leftover of 0.295.