Let's divide 640779 by 20
We want to divide 640779 by 20.

Let's proceed to step 1:
20 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 20

Moving on to step 2:
20 can be fit into 64 3 times, resulting in a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 60 from 64 and we're left with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 20

Going ahead to step 3:
When dividing 40 by 20, we get 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 32.0
Subtracting 40 from 40 leaves us with 0.
Fetch the next digit (7) from the dividend, attach it to 0 and continue: 7 / 20

Step 4:
If we divide 7 by 20, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 320.0
If we take 0 away from 7, we end up with 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 20

Moving on to step 5:
When dividing 77 by 20, we get 3 with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 3203.0
Subtracting 60 from 77 leaves us with 17.
Bring next digit (9) of the dividend behind the 17 and repeat the process: 179 / 20

Advancing to step 6:
179 divided by 20 is 8 with a remainder of 19.
The number 8 becomes the next digit in our result. 
Result so far: 32038.0
If we subtract 160 from 179, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
When dividing 190 by 20, we get 9 with a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 32038.9
The remainder is 10 after subtracting 180 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 32038.95
If we take 100 away from 100, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
If we divide 0 by 20, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 32038.95
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 32038.95
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 32038.95, with a leftover of 0.0.