We're dividing 21987489 by 904 
We want to divide 21987489 by 904.

On to step 1:
The number 904 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 904

Going ahead to step 2:
904 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (9) from the dividend to 21 and continue with: 219 / 904

Advancing to step 3:
904 can be fit into 219 0 times, resulting in a remainder of 219.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 219, we get 219.
Take the next digit (8) from the dividend and append it to 219, then repeat: 2198 / 904

Moving on to step 4:
2198 divided by 904 is 2 with a remainder of 390.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 1808 from 2198 and we're left with 390.
Include the next digit (7) from the dividend after 390, then repeat: 3907 / 904

On to step 5:
904 can be fit into 3907 4 times, resulting in a remainder of 291.
Write down 4 as next digit of the result. 
Result so far: 24.0
If we take 3616 away from 3907, we end up with 291.
Take the next digit (4) from the dividend and append it to 291, then repeat: 2914 / 904

Let's proceed to step 6:
2914 divided by 904 is 3 with a remainder of 202.
Use 3 as the next digit of our solution. 
Result so far: 243.0
The remainder is 202 after subtracting 2712 from 2914.
Take the next digit (8) from the dividend and append it to 202, then repeat: 2028 / 904

Going ahead to step 7:
The number 904 fits into 2028 2 times, leaving a remainder of 220.
Put 2 as the next digit of the answer. 
Result so far: 2432.0
Subtracting 1808 from 2028 leaves us with 220.
Grab the next digit (9) from the dividend, add it to 220, then carry on: 2209 / 904

Going ahead to step 8:
If we divide 2209 by 904, we get 2 and a remainder of 401.
Record the quotient 2 as the next digit in the result. 
Result so far: 24322.0
If we subtract 1808 from 2209, we get 401.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Advancing to step 9:
904 can be fit into 4010 4 times, resulting in a remainder of 394.
The next digit of our result is 4. 
Result so far: 24322.4
Subtract 3616 from 4010 to get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Step 10:
When dividing 3940 by 904, we get 4 with a remainder of 324.
Use 4 as the next digit of our solution. 
Result so far: 24322.44
Subtracting 3616 from 3940 leaves us with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Our division results in 24322.44 with a remaining 0.324.