920951 ÷ 21 
The aim is to understand the frequency of 21 in 920951.

Let's proceed to step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 21

Moving on to step 2:
21 can be fit into 92 4 times, resulting in a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 84 from 92 leaves us with 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 21

Let's proceed to step 3:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 43.0
Subtract 63 from 80 to get 17.
Include the next digit (9) from the dividend after 17, then repeat: 179 / 21

Advancing to step 4:
If we divide 179 by 21, we get 8 and a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 438.0
If we subtract 168 from 179, we get 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 21

Moving on to step 5:
When dividing 115 by 21, we get 5 with a remainder of 10.
The next digit of our result is 5. 
Result so far: 4385.0
Deduct 105 from 115 and we're left with 10.
Include the next digit (1) from the dividend after 10, then repeat: 101 / 21

Going ahead to step 6:
If we divide 101 by 21, we get 4 and a remainder of 17.
The next digit of our result is 4. 
Result so far: 43854.0
Deduct 84 from 101 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.

Moving on to step 7:
When dividing 170 by 21, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 43854.8
Subtract 168 from 170 to 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.

Let's proceed to step 8:
If we divide 20 by 21, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 43854.8
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 9:
The number 21 fits into 200 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 43854.809
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.

Let's proceed to step 10:
When dividing 110 by 21, we get 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 43854.8095
Subtracting 105 from 110 leaves us with 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 11:
If we divide 50 by 21, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 43854.80952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 12:
If we divide 80 by 21, we get 3 and a remainder of 17.
The next digit of our result is 3. 
Result so far: 43854.809523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 13:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 43854.8095238
If we take 168 away from 170, 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.

Going ahead to step 14:
If we divide 20 by 21, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 43854.8095238
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 43854.8095238 with a remainder of 2e-08.