815200 ÷ 90 
We want to divide 815200 by 90.

Step 1:
The number 90 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 90

Advancing to step 2:
When dividing 81 by 90, we get 0 with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Include the next digit (5) from the dividend after 81, then repeat: 815 / 90

Moving on to step 3:
90 goes into 815 9 times with a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Deduct 810 from 815 and we're left with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 90

Going ahead to step 4:
90 goes into 52 0 times with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 90.0
The remainder is 52 after subtracting 0 from 52.
Take the next digit (0) from the dividend and append it to 52, then repeat: 520 / 90

Let's proceed to step 5:
If we divide 520 by 90, we get 5 and a remainder of 70.
Use 5 as the next digit of our solution. 
Result so far: 905.0
The remainder is 70 after subtracting 450 from 520.
Grab the next digit (0) from the dividend, add it to 70, then carry on: 700 / 90

Step 6:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 9057.0
The remainder is 70 after subtracting 630 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 7:
90 goes into 700 7 times with a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 9057.7
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 8:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 9057.77
Deduct 630 from 700 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 9057.77, with a leftover of 0.07.