991554 ÷ 90 
We want to figure out the number of times 991554 can be divided by 90.

Going ahead to step 1:
90 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 90

Going ahead to step 2:
90 can be fit into 99 1 times, resulting in a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 90 from 99, we get 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 90

Step 3:
If we divide 91 by 90, we get 1 and a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtract 90 from 91 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 90

Let's proceed to step 4:
90 can be fit into 15 0 times, resulting in a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 110.0
Deduct 0 from 15 and we're left with 15.
Fetch the next digit (5) from the dividend, attach it to 15 and continue: 155 / 90

Step 5:
90 goes into 155 1 times with a remainder of 65.
Write down 1 as next digit of the result. 
Result so far: 1101.0
Deduct 90 from 155 and we're left with 65.
Fetch the next digit (4) from the dividend, attach it to 65 and continue: 654 / 90

Advancing to step 6:
The number 90 fits into 654 7 times, leaving a remainder of 24.
Write down 7 as next digit of the result. 
Result so far: 11017.0
Subtract 630 from 654 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 7:
If we divide 240 by 90, we get 2 and a remainder of 60.
The number 2 becomes the next digit in our result. 
Result so far: 11017.2
If we subtract 180 from 240, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 8:
600 divided by 90 is 6 with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 11017.26
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 9:
600 divided by 90 is 6 with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 11017.266
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final outcome is 11017.266, with a leftover of 0.006.