We look at the division of 243744 by 21 
We're looking to find how many times 21 goes into 243744.

Going ahead to step 1:
When dividing 2 by 21, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 21

Moving on to step 2:
24 divided by 21 is 1 with a remainder of 3.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 3 after subtracting 21 from 24.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 21

Advancing to step 3:
When dividing 33 by 21, we get 1 with a remainder of 12.
The next digit of our result is 1. 
Result so far: 11.0
Subtracting 21 from 33 leaves us with 12.
Fetch the next digit (7) from the dividend, attach it to 12 and continue: 127 / 21

Moving on to step 4:
21 can be fit into 127 6 times, resulting in a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 116.0
Subtracting 126 from 127 leaves us with 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 21

Step 5:
The number 21 fits into 14 0 times, leaving a remainder of 14.
The next digit of our result is 0. 
Result so far: 1160.0
Deduct 0 from 14 and we're left with 14.
Include the next digit (4) from the dividend after 14, then repeat: 144 / 21

Going ahead to step 6:
When dividing 144 by 21, we get 6 with a remainder of 18.
The number 6 becomes the next digit in our result. 
Result so far: 11606.0
Subtract 126 from 144 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
180 divided by 21 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 11606.8
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
21 goes into 120 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 11606.85
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 9:
If we divide 150 by 21, we get 7 and a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 11606.857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 10:
When dividing 30 by 21, we get 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 11606.8571
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 11:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 11606.85714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 12:
60 divided by 21 is 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 11606.857142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 13:
When dividing 180 by 21, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 11606.8571428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 14:
21 goes into 120 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 11606.85714285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

In conclusion, the division gives 11606.85714285 with a balance of 1.5e-08.