We're dividing 640024 by 81 
We want to divide 640024 by 81.

Step 1:
When dividing 6 by 81, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 81

Step 2:
81 goes into 64 0 times with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Include the next digit (0) from the dividend after 64, then repeat: 640 / 81

Going ahead to step 3:
81 goes into 640 7 times with a remainder of 73.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Deduct 567 from 640 and we're left with 73.
Fetch the next digit (0) from the dividend, attach it to 73 and continue: 730 / 81

On to step 4:
81 goes into 730 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 79.0
Subtracting 729 from 730 leaves us with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 81

On to step 5:
When dividing 12 by 81, we get 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 790.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (4) of the dividend behind the 12 and repeat the process: 124 / 81

Step 6:
When dividing 124 by 81, we get 1 with a remainder of 43.
Record the quotient 1 as the next digit in the result. 
Result so far: 7901.0
If we take 81 away from 124, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 7:
If we divide 430 by 81, we get 5 and a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 7901.5
Subtracting 405 from 430 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 8:
81 can be fit into 250 3 times, resulting in a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 7901.53
Deduct 243 from 250 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 9:
The number 81 fits into 70 0 times, leaving a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 7901.53
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 10:
81 can be fit into 700 8 times, resulting in a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 7901.5308
If we take 648 away from 700, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 11:
520 divided by 81 is 6 with a remainder of 34.
The next digit of our result is 6. 
Result so far: 7901.53086
If we subtract 486 from 520, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 12:
The number 81 fits into 340 4 times, leaving a remainder of 16.
The next digit of our result is 4. 
Result so far: 7901.530864
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 13:
160 divided by 81 is 1 with a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 7901.5308641
Deduct 81 from 160 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 14:
When dividing 790 by 81, we get 9 with a remainder of 61.
Write down 9 as next digit of the result. 
Result so far: 7901.53086419
Subtract 729 from 790 to get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

The final outcome is 7901.53086419, with a leftover of 6.1e-08.