We look at the division of 319645 by 20 
Let's see how many times 20 fits into 319645.

Going ahead to step 1:
20 goes into 3 0 times with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 20

Advancing to step 2:
When dividing 31 by 20, we get 1 with a remainder of 11.
The next digit of our result is 1. 
Result so far: 1.0
If we take 20 away from 31, we end up with 11.
Grab the next digit (9) from the dividend, add it to 11, then carry on: 119 / 20

Moving on to step 3:
If we divide 119 by 20, we get 5 and a remainder of 19.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Deduct 100 from 119 and we're left with 19.
Fetch the next digit (6) from the dividend, attach it to 19 and continue: 196 / 20

On to step 4:
If we divide 196 by 20, we get 9 and a remainder of 16.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
Subtract 180 from 196 to get 16.
Fetch the next digit (4) from the dividend, attach it to 16 and continue: 164 / 20

Advancing to step 5:
20 can be fit into 164 8 times, resulting in a remainder of 4.
The next digit of our result is 8. 
Result so far: 1598.0
The remainder is 4 after subtracting 160 from 164.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 20

Advancing to step 6:
The number 20 fits into 45 2 times, leaving a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 15982.0
The remainder is 5 after subtracting 40 from 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
50 divided by 20 is 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 15982.2
If we take 40 away from 50, we end up with 10.
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:
When dividing 100 by 20, we get 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 15982.25
Subtract 100 from 100 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.

Going ahead to step 9:
If we divide 0 by 20, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 15982.25
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.

Going ahead to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 15982.25
Deduct 0 from 0 and we're left 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.

The final result is 15982.25 with a remainder of 0.0.