We divide 21240816 by 485
We want to figure out the number of times 21240816 can be divided by 485.

On to step 1:
If we divide 2 by 485, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 485

Let's proceed to step 2:
The number 485 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Fetch the next digit (2) from the dividend, attach it to 21 and continue: 212 / 485

Moving on to step 3:
The number 485 fits into 212 0 times, leaving a remainder of 212.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 212 leaves us with 212.
Take the next digit (4) from the dividend and append it to 212, then repeat: 2124 / 485

Step 4:
485 goes into 2124 4 times with a remainder of 184.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 1940 from 2124, we get 184.
Include the next digit (0) from the dividend after 184, then repeat: 1840 / 485

Going ahead to step 5:
485 can be fit into 1840 3 times, resulting in a remainder of 385.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
Subtracting 1455 from 1840 leaves us with 385.
Fetch the next digit (8) from the dividend, attach it to 385 and continue: 3858 / 485

Step 6:
485 can be fit into 3858 7 times, resulting in a remainder of 463.
Write down 7 as next digit of the result. 
Result so far: 437.0
Deduct 3395 from 3858 and we're left with 463.
Fetch the next digit (1) from the dividend, attach it to 463 and continue: 4631 / 485

Step 7:
When dividing 4631 by 485, we get 9 with a remainder of 266.
Write down 9 as next digit of the result. 
Result so far: 4379.0
If we take 4365 away from 4631, we end up with 266.
Append the next digit (6) from the dividend to 266 and continue with: 2666 / 485

Let's proceed to step 8:
If we divide 2666 by 485, we get 5 and a remainder of 241.
The next digit of our result is 5. 
Result so far: 43795.0
Subtract 2425 from 2666 to get 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

On to step 9:
2410 divided by 485 is 4 with a remainder of 470.
The next digit of our result is 4. 
Result so far: 43795.4
The remainder is 470 after subtracting 1940 from 2410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Moving on to step 10:
4700 divided by 485 is 9 with a remainder of 335.
Write down 9 as next digit of the result. 
Result so far: 43795.49
Deduct 4365 from 4700 and we're left with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Moving on to step 11:
When dividing 3350 by 485, we get 6 with a remainder of 440.
The next digit of our result is 6. 
Result so far: 43795.496
If we subtract 2910 from 3350, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Going ahead to step 12:
When dividing 4400 by 485, we get 9 with a remainder of 35.
Use 9 as the next digit of our solution. 
Result so far: 43795.4969
Subtract 4365 from 4400 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 13:
350 divided by 485 is 0 with a remainder of 350.
Record the quotient 0 as the next digit in the result. 
Result so far: 43795.4969
The remainder is 350 after subtracting 0 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

On to step 14:
If we divide 3500 by 485, we get 7 and a remainder of 105.
Use 7 as the next digit of our solution. 
Result so far: 43795.496907
The remainder is 105 after subtracting 3395 from 3500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Moving on to step 15:
1050 divided by 485 is 2 with a remainder of 80.
Put 2 as the next digit of the answer. 
Result so far: 43795.4969072
Subtracting 970 from 1050 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 16:
485 can be fit into 800 1 times, resulting in a remainder of 315.
Put 1 as the next digit of the answer. 
Result so far: 43795.49690721
If we subtract 485 from 800, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

The final outcome is 43795.49690721, with a leftover of 3.15e-07.