640325 ÷ 81 
We're looking to find how many times 81 goes into 640325.

Advancing to step 1:
81 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 81

On to step 2:
81 goes into 64 0 times with a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Fetch the next digit (0) from the dividend, attach it to 64 and continue: 640 / 81

Advancing to step 3:
The number 81 fits into 640 7 times, leaving a remainder of 73.
The next digit of our result is 7. 
Result so far: 7.0
Subtracting 567 from 640 leaves us with 73.
Bring next digit (3) of the dividend behind the 73 and repeat the process: 733 / 81

Step 4:
81 can be fit into 733 9 times, resulting in a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 79.0
If we subtract 729 from 733, we get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 81

Moving on to step 5:
When dividing 42 by 81, we get 0 with a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 790.0
If we take 0 away from 42, we end up with 42.
Take the next digit (5) from the dividend and append it to 42, then repeat: 425 / 81

Going ahead to step 6:
81 goes into 425 5 times with a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 7905.0
The remainder is 20 after subtracting 405 from 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
If we divide 200 by 81, we get 2 and a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 7905.2
The remainder is 38 after subtracting 162 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 8:
81 can be fit into 380 4 times, resulting in a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 7905.24
Subtract 324 from 380 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 9:
81 can be fit into 560 6 times, resulting in a remainder of 74.
Write down 6 as next digit of the result. 
Result so far: 7905.246
Deduct 486 from 560 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 10:
740 divided by 81 is 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 7905.2469
Subtract 729 from 740 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 11:
The number 81 fits into 110 1 times, leaving a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 7905.24691
If we subtract 81 from 110, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 12:
81 goes into 290 3 times with a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 7905.246913
The remainder is 47 after subtracting 243 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 13:
81 can be fit into 470 5 times, resulting in a remainder of 65.
The next digit of our result is 5. 
Result so far: 7905.2469135
The remainder is 65 after subtracting 405 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 14:
When dividing 650 by 81, we get 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 7905.24691358
If we subtract 648 from 650, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 7905.24691358 with a remainder of 2e-09.