330630 ÷ 21 
We want to figure out the number of times 330630 can be divided by 21.

Step 1:
21 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 21

On to step 2:
21 goes into 33 1 times with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 21 from 33 leaves us with 12.
Fetch the next digit (0) from the dividend, attach it to 12 and continue: 120 / 21

Let's proceed to step 3:
If we divide 120 by 21, we get 5 and a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Deduct 105 from 120 and we're left with 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 21

Going ahead to step 4:
21 can be fit into 156 7 times, resulting in a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 157.0
If we take 147 away from 156, we end up with 9.
Append the next digit (3) from the dividend to 9 and continue with: 93 / 21

Going ahead to step 5:
21 can be fit into 93 4 times, resulting in a remainder of 9.
Put 4 as the next digit of the answer. 
Result so far: 1574.0
Deduct 84 from 93 and we're left with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 21

Let's proceed to step 6:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 15744.0
Subtracting 84 from 90 leaves us with 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 7:
60 divided by 21 is 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 15744.2
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 8:
180 divided by 21 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 15744.28
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 9:
21 can be fit into 120 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 15744.285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 10:
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: 15744.2857
Deduct 147 from 150 and we're left 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.

Step 11:
If we divide 30 by 21, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 15744.28571
If we subtract 21 from 30, we 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 12:
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: 15744.285714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 13:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 15744.2857142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 14:
When dividing 180 by 21, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 15744.28571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 15744.28571428 with a remaining 1.2e-08.