We look at the division of 132534 by 21 
The aim is to understand the frequency of 21 in 132534.

Moving on to step 1:
If we divide 1 by 21, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 21

Going ahead to step 2:
21 can be fit into 13 0 times, resulting in a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Include the next digit (2) from the dividend after 13, then repeat: 132 / 21

On to step 3:
21 goes into 132 6 times with a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 126 away from 132, we end up with 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 21

On to step 4:
The number 21 fits into 65 3 times, leaving a remainder of 2.
The next digit of our result is 3. 
Result so far: 63.0
If we subtract 63 from 65, we get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 21

On to step 5:
The number 21 fits into 23 1 times, leaving a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 631.0
Subtracting 21 from 23 leaves us with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 21

On to step 6:
When dividing 24 by 21, we get 1 with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 6311.0
If we subtract 21 from 24, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
30 divided by 21 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 6311.1
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 8:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 6311.14
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 9:
If we divide 60 by 21, we get 2 and a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 6311.142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 10:
If we divide 180 by 21, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 6311.1428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 11:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 6311.14285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 12:
When dividing 150 by 21, we get 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 6311.142857
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 6311.1428571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 14:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 6311.14285714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 6311.14285714 with a balance of 6e-09.