We divide 30212 by 21
The aim is to understand the frequency of 21 in 30212.

On to step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 21

Let's proceed to step 2:
The number 21 fits into 30 1 times, leaving a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 21 from 30, we get 9.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 21

Let's proceed to step 3:
92 divided by 21 is 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 14.0
Subtract 84 from 92 to get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 21

On to step 4:
The number 21 fits into 81 3 times, leaving a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 143.0
If we take 63 away from 81, we end up with 18.
Append the next digit (2) from the dividend to 18 and continue with: 182 / 21

Going ahead to step 5:
The number 21 fits into 182 8 times, leaving a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 1438.0
The remainder is 14 after subtracting 168 from 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 6:
The number 21 fits into 140 6 times, leaving a remainder of 14.
The next digit of our result is 6. 
Result so far: 1438.6
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
The number 21 fits into 140 6 times, leaving a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 1438.66
Subtracting 126 from 140 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

After the division, we end up with 1438.66 and a remainder of 0.014.