Let's divide 90039187 by 321
Our goal is to divide 90039187 by 321.

On to step 1:
The number 321 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 321

Step 2:
321 can be fit into 90 0 times, resulting in a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 90 leaves us with 90.
Grab the next digit (0) from the dividend, add it to 90, then carry on: 900 / 321

On to step 3:
321 goes into 900 2 times with a remainder of 258.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 642 from 900 to get 258.
Include the next digit (3) from the dividend after 258, then repeat: 2583 / 321

Let's proceed to step 4:
321 can be fit into 2583 8 times, resulting in a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 28.0
Deduct 2568 from 2583 and we're left with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 321

Going ahead to step 5:
The number 321 fits into 159 0 times, leaving a remainder of 159.
The number 0 becomes the next digit in our result. 
Result so far: 280.0
Subtracting 0 from 159 leaves us with 159.
Take the next digit (1) from the dividend and append it to 159, then repeat: 1591 / 321

Going ahead to step 6:
The number 321 fits into 1591 4 times, leaving a remainder of 307.
The next digit of our result is 4. 
Result so far: 2804.0
The remainder is 307 after subtracting 1284 from 1591.
Fetch the next digit (8) from the dividend, attach it to 307 and continue: 3078 / 321

On to step 7:
The number 321 fits into 3078 9 times, leaving a remainder of 189.
Write down 9 as next digit of the result. 
Result so far: 28049.0
Deduct 2889 from 3078 and we're left with 189.
Take the next digit (7) from the dividend and append it to 189, then repeat: 1897 / 321

On to step 8:
1897 divided by 321 is 5 with a remainder of 292.
The number 5 becomes the next digit in our result. 
Result so far: 280495.0
The remainder is 292 after subtracting 1605 from 1897.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Advancing to step 9:
321 can be fit into 2920 9 times, resulting in a remainder of 31.
Write down 9 as next digit of the result. 
Result so far: 280495.9
Deduct 2889 from 2920 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 10:
If we divide 310 by 321, we get 0 and a remainder of 310.
Use 0 as the next digit of our solution. 
Result so far: 280495.9
Subtracting 0 from 310 leaves us with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Let's proceed to step 11:
The number 321 fits into 3100 9 times, leaving a remainder of 211.
The number 9 becomes the next digit in our result. 
Result so far: 280495.909
Subtract 2889 from 3100 to get 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Step 12:
321 goes into 2110 6 times with a remainder of 184.
Put 6 as the next digit of the answer. 
Result so far: 280495.9096
The remainder is 184 after subtracting 1926 from 2110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Let's proceed to step 13:
321 goes into 1840 5 times with a remainder of 235.
Use 5 as the next digit of our solution. 
Result so far: 280495.90965
The remainder is 235 after subtracting 1605 from 1840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Moving on to step 14:
If we divide 2350 by 321, we get 7 and a remainder of 103.
The number 7 becomes the next digit in our result. 
Result so far: 280495.909657
If we subtract 2247 from 2350, we get 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

On to step 15:
The number 321 fits into 1030 3 times, leaving a remainder of 67.
Record the quotient 3 as the next digit in the result. 
Result so far: 280495.9096573
The remainder is 67 after subtracting 963 from 1030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Advancing to step 16:
If we divide 670 by 321, we get 2 and a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 280495.90965732
The remainder is 28 after subtracting 642 from 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Our division results in 280495.90965732 with a remaining 2.8e-08.