We're dividing 21439 by 9 
Our goal is to divide 21439 by 9.

Step 1:
2 divided by 9 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 9

Advancing to step 2:
21 divided by 9 is 2 with a remainder of 3.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 18 from 21 and we're left with 3.
Grab the next digit (4) from the dividend, add it to 3, then carry on: 34 / 9

Moving on to step 3:
9 can be fit into 34 3 times, resulting in a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
Deduct 27 from 34 and we're left with 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 9

Step 4:
9 can be fit into 73 8 times, resulting in a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 238.0
If we take 72 away from 73, we end up with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 9

Advancing to step 5:
When dividing 19 by 9, we get 2 with a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 2382.0
Subtract 18 from 19 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 6:
9 can be fit into 10 1 times, resulting in a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 2382.1
Subtracting 9 from 10 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
When dividing 10 by 9, we get 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 2382.11
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Our division results in 2382.11 with a remaining 0.001.