21300 divided by 3 
Let's see how many times 3 fits into 21300.

Step 1:
The number 3 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 3

Step 2:
3 can be fit into 21 7 times, resulting in a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtract 21 from 21 to get 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 3

Going ahead to step 3:
3 goes into 3 1 times with a remainder of 0.
The next digit of our result is 1. 
Result so far: 71.0
If we take 3 away from 3, we end up with 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 3

Going ahead to step 4:
3 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 710.0
The remainder is 0 after subtracting 0 from 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 3

Advancing to step 5:
3 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7100.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 6:
If we divide 0 by 3, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 7100.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 7:
If we divide 0 by 3, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7100.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 7100.0 with a remainder of 0.0.