We look at the division of 630140 by 21 
Our goal is to divide 630140 by 21.

Let's proceed 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
If we subtract 0 from 6, we get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 21

Going ahead to step 2:
21 goes into 63 3 times with a remainder of 0.
The next digit of our result is 3. 
Result so far: 3.0
If we take 63 away from 63, we end up with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 21

Going ahead to step 3:
0 divided by 21 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 30.0
If we subtract 0 from 0, we get 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 21

Let's proceed to step 4:
1 divided by 21 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 300.0
Subtract 0 from 1 to get 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 21

Going ahead to step 5:
14 divided by 21 is 0 with a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 3000.0
Subtracting 0 from 14 leaves us with 14.
Take the next digit (0) from the dividend and append it to 14, then repeat: 140 / 21

Going ahead to step 6:
140 divided by 21 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 30006.0
If we subtract 126 from 140, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
140 divided by 21 is 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 30006.6
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
140 divided by 21 is 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 30006.66
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 30006.66, with a leftover of 0.014.