279243 ÷ 20 
Our goal is to divide 279243 by 20.

Let's proceed to step 1:
The number 20 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (7) from the dividend to 2 and continue with: 27 / 20

Let's proceed to step 2:
20 goes into 27 1 times with a remainder of 7.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 20 from 27 to get 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 20

On to step 3:
20 can be fit into 79 3 times, resulting in a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we take 60 away from 79, we end up with 19.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 20

On to step 4:
20 goes into 192 9 times with a remainder of 12.
The next digit of our result is 9. 
Result so far: 139.0
The remainder is 12 after subtracting 180 from 192.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 20

Let's proceed to step 5:
If we divide 124 by 20, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 1396.0
Deduct 120 from 124 and we're left with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 20

Advancing to step 6:
If we divide 43 by 20, we get 2 and a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 13962.0
Subtract 40 from 43 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
20 can be fit into 30 1 times, resulting in a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 13962.1
Deduct 20 from 30 and we're left 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.

Let's proceed to step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 13962.15
Deduct 100 from 100 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.

Let's proceed to step 9:
20 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 13962.15
Subtracting 0 from 0 leaves us 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:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 13962.15
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.

The final result is 13962.15 with a remainder of 0.0.