We're dividing 967976 by 21 
The aim is to understand the frequency of 21 in 967976.

Advancing to step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 21

Going ahead to step 2:
The number 21 fits into 96 4 times, leaving a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 84 from 96 to get 12.
Take the next digit (7) from the dividend and append it to 12, then repeat: 127 / 21

Let's proceed to step 3:
When dividing 127 by 21, we get 6 with a remainder of 1.
Record the quotient 6 as the next digit in the result. 
Result so far: 46.0
Subtracting 126 from 127 leaves us with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 21

Step 4:
21 goes into 19 0 times with a remainder of 19.
Put 0 as the next digit of the answer. 
Result so far: 460.0
Subtract 0 from 19 to get 19.
Include the next digit (7) from the dividend after 19, then repeat: 197 / 21

Step 5:
197 divided by 21 is 9 with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 4609.0
Deduct 189 from 197 and we're left with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 21

Step 6:
21 goes into 86 4 times with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 46094.0
If we take 84 away from 86, we end up 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 7:
21 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 46094.0
Subtract 0 from 20 to get 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 8:
21 goes into 200 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 46094.09
Subtracting 189 from 200 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.

Moving on to step 9:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 46094.095
If we subtract 105 from 110, we 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.

Going ahead to step 10:
When dividing 50 by 21, we get 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 46094.0952
Deduct 42 from 50 and we're left 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.

Let's proceed to step 11:
80 divided by 21 is 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 46094.09523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 12:
21 goes into 170 8 times with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 46094.095238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 13:
When dividing 20 by 21, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 46094.095238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 14:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 46094.09523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

After the division, we end up with 46094.09523809 and a remainder of 1.1e-08.