We look at the division of 90308577 by 231 
We want to divide 90308577 by 231.

On to step 1:
If we divide 9 by 231, we get 0 and a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 231

Let's proceed to step 2:
When dividing 90 by 231, we get 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Include the next digit (3) from the dividend after 90, then repeat: 903 / 231

Let's proceed to step 3:
231 goes into 903 3 times with a remainder of 210.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 693 from 903 to get 210.
Bring next digit (0) of the dividend behind the 210 and repeat the process: 2100 / 231

Step 4:
If we divide 2100 by 231, we get 9 and a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 39.0
Subtracting 2079 from 2100 leaves us with 21.
Take the next digit (8) from the dividend and append it to 21, then repeat: 218 / 231

Going ahead to step 5:
When dividing 218 by 231, we get 0 with a remainder of 218.
Write down 0 as next digit of the result. 
Result so far: 390.0
If we subtract 0 from 218, we get 218.
Grab the next digit (5) from the dividend, add it to 218, then carry on: 2185 / 231

Going ahead to step 6:
231 goes into 2185 9 times with a remainder of 106.
The number 9 becomes the next digit in our result. 
Result so far: 3909.0
If we subtract 2079 from 2185, we get 106.
Take the next digit (7) from the dividend and append it to 106, then repeat: 1067 / 231

Advancing to step 7:
When dividing 1067 by 231, we get 4 with a remainder of 143.
Put 4 as the next digit of the answer. 
Result so far: 39094.0
Subtract 924 from 1067 to get 143.
Take the next digit (7) from the dividend and append it to 143, then repeat: 1437 / 231

Step 8:
The number 231 fits into 1437 6 times, leaving a remainder of 51.
Write down 6 as next digit of the result. 
Result so far: 390946.0
If we subtract 1386 from 1437, we get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 9:
231 goes into 510 2 times with a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 390946.2
Subtracting 462 from 510 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 10:
480 divided by 231 is 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 390946.22
Subtract 462 from 480 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final result is 390946.22 with a remainder of 0.018.