941206 ÷ 21 
The aim is to understand the frequency of 21 in 941206.

On to step 1:
21 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (4) from the dividend and append it to 9, then repeat: 94 / 21

Advancing to step 2:
21 goes into 94 4 times with a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 84 from 94 to get 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 21

Going ahead to step 3:
101 divided by 21 is 4 with a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 44.0
If we take 84 away from 101, we end up with 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 21

Step 4:
If we divide 172 by 21, we get 8 and a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 448.0
If we subtract 168 from 172, we get 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 21

Moving on to step 5:
21 goes into 40 1 times with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 4481.0
If we take 21 away from 40, we end up with 19.
Bring next digit (6) of the dividend behind the 19 and repeat the process: 196 / 21

Step 6:
21 can be fit into 196 9 times, resulting in a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 44819.0
Subtract 189 from 196 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
When dividing 70 by 21, we get 3 with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 44819.3
Subtracting 63 from 70 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
21 can be fit into 70 3 times, resulting in a remainder of 7.
The next digit of our result is 3. 
Result so far: 44819.33
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Our division results in 44819.33 with a remaining 0.007.