Let's divide 624816 by 21
We want to figure out the number of times 624816 can be divided by 21.

On to step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 21

Let's proceed to step 2:
If we divide 62 by 21, we get 2 and a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 42 from 62 and we're left with 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 21

Step 3:
21 goes into 204 9 times with a remainder of 15.
The next digit of our result is 9. 
Result so far: 29.0
Subtracting 189 from 204 leaves us with 15.
Take the next digit (8) from the dividend and append it to 15, then repeat: 158 / 21

Going ahead to step 4:
158 divided by 21 is 7 with a remainder of 11.
Write down 7 as next digit of the result. 
Result so far: 297.0
Deduct 147 from 158 and we're left with 11.
Fetch the next digit (1) from the dividend, attach it to 11 and continue: 111 / 21

Going ahead to step 5:
When dividing 111 by 21, we get 5 with a remainder of 6.
The next digit of our result is 5. 
Result so far: 2975.0
Subtract 105 from 111 to get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 21

Step 6:
21 can be fit into 66 3 times, resulting in a remainder of 3.
The next digit of our result is 3. 
Result so far: 29753.0
If we subtract 63 from 66, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
If we divide 30 by 21, we get 1 and a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 29753.1
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 8:
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: 29753.14
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 9:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 29753.142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 10:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 29753.1428
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.

Let's proceed to step 11:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 29753.14285
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.

Going ahead to step 12:
If we divide 150 by 21, we get 7 and a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 29753.142857
If we take 147 away from 150, we end up 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 13:
30 divided by 21 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 29753.1428571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 14:
90 divided by 21 is 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 29753.14285714
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.

After the division, we end up with 29753.14285714 and a remainder of 6e-09.