Let's divide 133662 by 21
The aim is to understand the frequency of 21 in 133662.

Step 1:
The number 21 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 21

Going ahead to step 2:
21 goes into 13 0 times with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 21

Let's proceed to step 3:
133 divided by 21 is 6 with a remainder of 7.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 126 from 133 to get 7.
Bring next digit (6) of the dividend behind the 7 and repeat the process: 76 / 21

Going ahead to step 4:
76 divided by 21 is 3 with a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 63.0
If we subtract 63 from 76, we get 13.
Include the next digit (6) from the dividend after 13, then repeat: 136 / 21

Advancing to step 5:
When dividing 136 by 21, we get 6 with a remainder of 10.
The next digit of our result is 6. 
Result so far: 636.0
Subtracting 126 from 136 leaves us with 10.
Take the next digit (2) from the dividend and append it to 10, then repeat: 102 / 21

Going ahead to step 6:
When dividing 102 by 21, we get 4 with a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 6364.0
Subtracting 84 from 102 leaves us 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.

On to step 7:
If we divide 180 by 21, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 6364.8
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
When dividing 120 by 21, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 6364.85
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 9:
When dividing 150 by 21, we get 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 6364.857
If we subtract 147 from 150, 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.

Moving on to step 10:
If we divide 30 by 21, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 6364.8571
Subtract 21 from 30 to get 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 11:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 6364.85714
If we take 84 away from 90, we end up 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.

Step 12:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 6364.857142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 6364.8571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
120 divided by 21 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 6364.85714285
Subtracting 105 from 120 leaves us 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.

After the division, we end up with 6364.85714285 and a remainder of 1.5e-08.