We look at the division of 21276 by 63 
We want to divide 21276 by 63.

On to step 1:
The number 63 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 63

On to step 2:
63 can be fit into 21 0 times, resulting in a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Grab the next digit (2) from the dividend, add it to 21, then carry on: 212 / 63

Moving on to step 3:
63 goes into 212 3 times with a remainder of 23.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 189 from 212 to get 23.
Take the next digit (7) from the dividend and append it to 23, then repeat: 237 / 63

Going ahead to step 4:
The number 63 fits into 237 3 times, leaving a remainder of 48.
Put 3 as the next digit of the answer. 
Result so far: 33.0
Deduct 189 from 237 and we're left with 48.
Take the next digit (6) from the dividend and append it to 48, then repeat: 486 / 63

Step 5:
63 goes into 486 7 times with a remainder of 45.
Put 7 as the next digit of the answer. 
Result so far: 337.0
If we take 441 away from 486, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 6:
450 divided by 63 is 7 with a remainder of 9.
The next digit of our result is 7. 
Result so far: 337.7
If we take 441 away from 450, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
When dividing 90 by 63, we get 1 with a remainder of 27.
Put 1 as the next digit of the answer. 
Result so far: 337.71
Subtracting 63 from 90 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 8:
63 can be fit into 270 4 times, resulting in a remainder of 18.
Record the quotient 4 as the next digit in the result. 
Result so far: 337.714
Deduct 252 from 270 and we're left 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.

Let's proceed to step 9:
63 can be fit into 180 2 times, resulting in a remainder of 54.
The number 2 becomes the next digit in our result. 
Result so far: 337.7142
Subtract 126 from 180 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 10:
The number 63 fits into 540 8 times, leaving a remainder of 36.
Record the quotient 8 as the next digit in the result. 
Result so far: 337.71428
If we take 504 away from 540, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 11:
If we divide 360 by 63, we get 5 and a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 337.714285
Subtracting 315 from 360 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 12:
The number 63 fits into 450 7 times, leaving a remainder of 9.
Use 7 as the next digit of our solution. 
Result so far: 337.7142857
Deduct 441 from 450 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 13:
90 divided by 63 is 1 with a remainder of 27.
Use 1 as the next digit of our solution. 
Result so far: 337.71428571
Subtracting 63 from 90 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The final outcome is 337.71428571, with a leftover of 2.7e-08.