We look at the division of 21300 by 90 
We're looking to find how many times 90 goes into 21300.

Step 1:
2 divided by 90 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 90

Advancing to step 2:
When dividing 21 by 90, we get 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Bring next digit (3) of the dividend behind the 21 and repeat the process: 213 / 90

On to step 3:
The number 90 fits into 213 2 times, leaving a remainder of 33.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 180 away from 213, we end up with 33.
Grab the next digit (0) from the dividend, add it to 33, then carry on: 330 / 90

Moving on to step 4:
90 goes into 330 3 times with a remainder of 60.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
The remainder is 60 after subtracting 270 from 330.
Bring next digit (0) of the dividend behind the 60 and repeat the process: 600 / 90

Step 5:
The number 90 fits into 600 6 times, leaving a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 236.0
If we subtract 540 from 600, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 6:
When dividing 600 by 90, we get 6 with a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 236.6
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 7:
600 divided by 90 is 6 with a remainder of 60.
Write down 6 as next digit of the result. 
Result so far: 236.66
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

In conclusion, the division gives 236.66 with a balance of 0.06.