Let's divide 21404453 by 489
Our goal is to divide 21404453 by 489.

Going ahead to step 1:
489 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 489

Advancing to step 2:
21 divided by 489 is 0 with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Bring next digit (4) of the dividend behind the 21 and repeat the process: 214 / 489

Let's proceed to step 3:
When dividing 214 by 489, we get 0 with a remainder of 214.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 214 after subtracting 0 from 214.
Fetch the next digit (0) from the dividend, attach it to 214 and continue: 2140 / 489

Advancing to step 4:
489 goes into 2140 4 times with a remainder of 184.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 1956 from 2140 to get 184.
Grab the next digit (4) from the dividend, add it to 184, then carry on: 1844 / 489

Step 5:
The number 489 fits into 1844 3 times, leaving a remainder of 377.
Write down 3 as next digit of the result. 
Result so far: 43.0
If we take 1467 away from 1844, we end up with 377.
Include the next digit (4) from the dividend after 377, then repeat: 3774 / 489

On to step 6:
The number 489 fits into 3774 7 times, leaving a remainder of 351.
Use 7 as the next digit of our solution. 
Result so far: 437.0
Deduct 3423 from 3774 and we're left with 351.
Fetch the next digit (5) from the dividend, attach it to 351 and continue: 3515 / 489

Going ahead to step 7:
The number 489 fits into 3515 7 times, leaving a remainder of 92.
Put 7 as the next digit of the answer. 
Result so far: 4377.0
The remainder is 92 after subtracting 3423 from 3515.
Bring next digit (3) of the dividend behind the 92 and repeat the process: 923 / 489

On to step 8:
If we divide 923 by 489, we get 1 and a remainder of 434.
Put 1 as the next digit of the answer. 
Result so far: 43771.0
The remainder is 434 after subtracting 489 from 923.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4340, and continue the process.

Moving on to step 9:
4340 divided by 489 is 8 with a remainder of 428.
The next digit of our result is 8. 
Result so far: 43771.8
Deduct 3912 from 4340 and we're left with 428.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4280, and continue the process.

Moving on to step 10:
When dividing 4280 by 489, we get 8 with a remainder of 368.
Use 8 as the next digit of our solution. 
Result so far: 43771.88
Subtracting 3912 from 4280 leaves us with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

The final outcome is 43771.88, with a leftover of 0.368.