81901939 divided by 320 
Let's see how many times 320 fits into 81901939.

Going ahead to step 1:
8 divided by 320 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 320

Moving on to step 2:
The number 320 fits into 81 0 times, leaving a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Bring next digit (9) of the dividend behind the 81 and repeat the process: 819 / 320

Advancing to step 3:
819 divided by 320 is 2 with a remainder of 179.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 640 from 819 to get 179.
Take the next digit (0) from the dividend and append it to 179, then repeat: 1790 / 320

Going ahead to step 4:
The number 320 fits into 1790 5 times, leaving a remainder of 190.
The next digit of our result is 5. 
Result so far: 25.0
Subtracting 1600 from 1790 leaves us with 190.
Fetch the next digit (1) from the dividend, attach it to 190 and continue: 1901 / 320

Step 5:
1901 divided by 320 is 5 with a remainder of 301.
The number 5 becomes the next digit in our result. 
Result so far: 255.0
The remainder is 301 after subtracting 1600 from 1901.
Append the next digit (9) from the dividend to 301 and continue with: 3019 / 320

Moving on to step 6:
3019 divided by 320 is 9 with a remainder of 139.
The number 9 becomes the next digit in our result. 
Result so far: 2559.0
Deduct 2880 from 3019 and we're left with 139.
Append the next digit (3) from the dividend to 139 and continue with: 1393 / 320

Moving on to step 7:
The number 320 fits into 1393 4 times, leaving a remainder of 113.
The next digit of our result is 4. 
Result so far: 25594.0
The remainder is 113 after subtracting 1280 from 1393.
Fetch the next digit (9) from the dividend, attach it to 113 and continue: 1139 / 320

Moving on to step 8:
When dividing 1139 by 320, we get 3 with a remainder of 179.
Record the quotient 3 as the next digit in the result. 
Result so far: 255943.0
Subtracting 960 from 1139 leaves us with 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Going ahead to step 9:
320 goes into 1790 5 times with a remainder of 190.
Use 5 as the next digit of our solution. 
Result so far: 255943.5
The remainder is 190 after subtracting 1600 from 1790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Advancing to step 10:
When dividing 1900 by 320, we get 5 with a remainder of 300.
The number 5 becomes the next digit in our result. 
Result so far: 255943.55
Subtracting 1600 from 1900 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The final outcome is 255943.55, with a leftover of 0.3.