We're dividing 21640 by 30 
We want to figure out the number of times 21640 can be divided by 30.

Going ahead to step 1:
30 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 30

Going ahead to step 2:
If we divide 21 by 30, we get 0 and a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 30

Advancing to step 3:
If we divide 216 by 30, we get 7 and a remainder of 6.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 6 after subtracting 210 from 216.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 30

On to step 4:
When dividing 64 by 30, we get 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 72.0
Deduct 60 from 64 and we're left with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 30

Moving on to step 5:
30 can be fit into 40 1 times, resulting in a remainder of 10.
The next digit of our result is 1. 
Result so far: 721.0
If we take 30 away from 40, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 6:
100 divided by 30 is 3 with a remainder of 10.
Use 3 as the next digit of our solution. 
Result so far: 721.3
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 7:
When dividing 100 by 30, we get 3 with a remainder of 10.
The next digit of our result is 3. 
Result so far: 721.33
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 721.33 with a remainder of 0.01.