282772 ÷ 21 
The aim is to understand the frequency of 21 in 282772.

On to step 1:
2 divided by 21 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 21

Moving on to step 2:
The number 21 fits into 28 1 times, leaving a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 21 from 28, we get 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 21

Advancing to step 3:
21 goes into 72 3 times with a remainder of 9.
The next digit of our result is 3. 
Result so far: 13.0
Subtract 63 from 72 to get 9.
Fetch the next digit (7) from the dividend, attach it to 9 and continue: 97 / 21

Let's proceed to step 4:
The number 21 fits into 97 4 times, leaving a remainder of 13.
Put 4 as the next digit of the answer. 
Result so far: 134.0
If we subtract 84 from 97, we get 13.
Fetch the next digit (7) from the dividend, attach it to 13 and continue: 137 / 21

Moving on to step 5:
If we divide 137 by 21, we get 6 and a remainder of 11.
Record the quotient 6 as the next digit in the result. 
Result so far: 1346.0
If we take 126 away from 137, we end up with 11.
Fetch the next digit (2) from the dividend, attach it to 11 and continue: 112 / 21

Going ahead to step 6:
If we divide 112 by 21, we get 5 and a remainder of 7.
Put 5 as the next digit of the answer. 
Result so far: 13465.0
Subtracting 105 from 112 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
The number 21 fits into 70 3 times, leaving a remainder of 7.
The next digit of our result is 3. 
Result so far: 13465.3
If we subtract 63 from 70, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 8:
21 goes into 70 3 times with a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 13465.33
If we take 63 away from 70, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final result is 13465.33 with a remainder of 0.007.