90208389 ÷ 400 
Our goal is to divide 90208389 by 400.

Step 1:
When dividing 9 by 400, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 400

On to step 2:
If we divide 90 by 400, we get 0 and a remainder of 90.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Append the next digit (2) from the dividend to 90 and continue with: 902 / 400

On to step 3:
The number 400 fits into 902 2 times, leaving a remainder of 102.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 102 after subtracting 800 from 902.
Fetch the next digit (0) from the dividend, attach it to 102 and continue: 1020 / 400

On to step 4:
The number 400 fits into 1020 2 times, leaving a remainder of 220.
The next digit of our result is 2. 
Result so far: 22.0
If we subtract 800 from 1020, we get 220.
Append the next digit (8) from the dividend to 220 and continue with: 2208 / 400

Moving on to step 5:
400 can be fit into 2208 5 times, resulting in a remainder of 208.
The next digit of our result is 5. 
Result so far: 225.0
If we subtract 2000 from 2208, we get 208.
Fetch the next digit (3) from the dividend, attach it to 208 and continue: 2083 / 400

Let's proceed to step 6:
400 can be fit into 2083 5 times, resulting in a remainder of 83.
Put 5 as the next digit of the answer. 
Result so far: 2255.0
If we take 2000 away from 2083, we end up with 83.
Bring next digit (8) of the dividend behind the 83 and repeat the process: 838 / 400

Step 7:
The number 400 fits into 838 2 times, leaving a remainder of 38.
The next digit of our result is 2. 
Result so far: 22552.0
The remainder is 38 after subtracting 800 from 838.
Bring next digit (9) of the dividend behind the 38 and repeat the process: 389 / 400

Let's proceed to step 8:
The number 400 fits into 389 0 times, leaving a remainder of 389.
Record the quotient 0 as the next digit in the result. 
Result so far: 225520.0
Subtracting 0 from 389 leaves us with 389.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3890, and continue the process.

Step 9:
400 goes into 3890 9 times with a remainder of 290.
Record the quotient 9 as the next digit in the result. 
Result so far: 225520.9
If we subtract 3600 from 3890, we get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 10:
If we divide 2900 by 400, we get 7 and a remainder of 100.
The number 7 becomes the next digit in our result. 
Result so far: 225520.97
The remainder is 100 after subtracting 2800 from 2900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 11:
The number 400 fits into 1000 2 times, leaving a remainder of 200.
The number 2 becomes the next digit in our result. 
Result so far: 225520.972
Subtract 800 from 1000 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 12:
When dividing 2000 by 400, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 225520.9725
Deduct 2000 from 2000 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 13:
When dividing 0 by 400, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 225520.9725
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 14:
400 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 225520.9725
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 225520.9725, with a leftover of 0.0.