We look at the division of 81385310 by 321 
We're looking to find how many times 321 goes into 81385310.

Advancing to step 1:
321 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 321

Let's proceed to step 2:
The number 321 fits into 81 0 times, leaving a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Grab the next digit (3) from the dividend, add it to 81, then carry on: 813 / 321

On to step 3:
When dividing 813 by 321, we get 2 with a remainder of 171.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 642 from 813 to get 171.
Fetch the next digit (8) from the dividend, attach it to 171 and continue: 1718 / 321

Going ahead to step 4:
If we divide 1718 by 321, we get 5 and a remainder of 113.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
The remainder is 113 after subtracting 1605 from 1718.
Bring next digit (5) of the dividend behind the 113 and repeat the process: 1135 / 321

Step 5:
321 goes into 1135 3 times with a remainder of 172.
The next digit of our result is 3. 
Result so far: 253.0
Subtract 963 from 1135 to get 172.
Bring next digit (3) of the dividend behind the 172 and repeat the process: 1723 / 321

Let's proceed to step 6:
321 goes into 1723 5 times with a remainder of 118.
Write down 5 as next digit of the result. 
Result so far: 2535.0
The remainder is 118 after subtracting 1605 from 1723.
Append the next digit (1) from the dividend to 118 and continue with: 1181 / 321

Step 7:
When dividing 1181 by 321, we get 3 with a remainder of 218.
Write down 3 as next digit of the result. 
Result so far: 25353.0
If we subtract 963 from 1181, we get 218.
Take the next digit (0) from the dividend and append it to 218, then repeat: 2180 / 321

Going ahead to step 8:
If we divide 2180 by 321, we get 6 and a remainder of 254.
Record the quotient 6 as the next digit in the result. 
Result so far: 253536.0
The remainder is 254 after subtracting 1926 from 2180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Advancing to step 9:
When dividing 2540 by 321, we get 7 with a remainder of 293.
The next digit of our result is 7. 
Result so far: 253536.7
Subtract 2247 from 2540 to get 293.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

Let's proceed to step 10:
321 goes into 2930 9 times with a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 253536.79
Subtract 2889 from 2930 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 11:
The number 321 fits into 410 1 times, leaving a remainder of 89.
Write down 1 as next digit of the result. 
Result so far: 253536.791
If we take 321 away from 410, we end up with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Advancing to step 12:
321 goes into 890 2 times with a remainder of 248.
The next digit of our result is 2. 
Result so far: 253536.7912
Deduct 642 from 890 and we're left with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Advancing to step 13:
321 goes into 2480 7 times with a remainder of 233.
Put 7 as the next digit of the answer. 
Result so far: 253536.79127
If we take 2247 away from 2480, we end up with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Let's proceed to step 14:
If we divide 2330 by 321, we get 7 and a remainder of 83.
Record the quotient 7 as the next digit in the result. 
Result so far: 253536.791277
Deduct 2247 from 2330 and we're left with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

After the division, we end up with 253536.791277 and a remainder of 8.3e-06.