We look at the division of 714263 by 21 
The aim is to understand the frequency of 21 in 714263.

Step 1:
The number 21 fits into 7 0 times, leaving a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 21

Advancing to step 2:
21 goes into 71 3 times with a remainder of 8.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 63 from 71 to get 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 21

Moving on to step 3:
If we divide 84 by 21, we get 4 and a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 34.0
The remainder is 0 after subtracting 84 from 84.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 21

Advancing to step 4:
21 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 340.0
Subtract 0 from 2 to get 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 21

Going ahead to step 5:
21 goes into 26 1 times with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 3401.0
Deduct 21 from 26 and we're left with 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 21

Let's proceed to step 6:
21 goes into 53 2 times with a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 34012.0
Subtracting 42 from 53 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
21 goes into 110 5 times with a remainder of 5.
The next digit of our result is 5. 
Result so far: 34012.5
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 34012.52
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 9:
The number 21 fits into 80 3 times, leaving a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 34012.523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 10:
If we divide 170 by 21, we get 8 and a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 34012.5238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 11:
20 divided by 21 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 34012.5238
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 12:
If we divide 200 by 21, we get 9 and a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 34012.523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 13:
21 goes into 110 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 34012.5238095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 14:
When dividing 50 by 21, we get 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 34012.52380952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 34012.52380952 with a balance of 8e-09.