We look at the division of 966949 by 21 
The aim is to understand the frequency of 21 in 966949.

Moving on to step 1:
21 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 21

Moving on to step 2:
When dividing 96 by 21, we get 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 12 after subtracting 84 from 96.
Bring next digit (6) of the dividend behind the 12 and repeat the process: 126 / 21

On to step 3:
126 divided by 21 is 6 with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 46.0
Subtracting 126 from 126 leaves us with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 21

On to step 4:
9 divided by 21 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 460.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (4) from the dividend and append it to 9, then repeat: 94 / 21

Let's proceed to step 5:
When dividing 94 by 21, we get 4 with a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 4604.0
Subtracting 84 from 94 leaves us with 10.
Grab the next digit (9) from the dividend, add it to 10, then carry on: 109 / 21

Going ahead to step 6:
21 can be fit into 109 5 times, resulting in a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 46045.0
If we subtract 105 from 109, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
When dividing 40 by 21, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 46045.1
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 8:
If we divide 190 by 21, we get 9 and a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 46045.19
If we take 189 away from 190, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 9:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 46045.19
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
When dividing 100 by 21, we get 4 with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 46045.1904
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 11:
160 divided by 21 is 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 46045.19047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 12:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 46045.190476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 13:
If we divide 40 by 21, we get 1 and a remainder of 19.
The next digit of our result is 1. 
Result so far: 46045.1904761
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
21 goes into 190 9 times with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 46045.19047619
Subtracting 189 from 190 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final outcome is 46045.19047619, with a leftover of 1e-09.