We divide 956996 by 21
The aim is to understand the frequency of 21 in 956996.

Moving on to step 1:
9 divided by 21 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 21

Going ahead to step 2:
21 goes into 95 4 times with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 11 after subtracting 84 from 95.
Include the next digit (6) from the dividend after 11, then repeat: 116 / 21

On to step 3:
116 divided by 21 is 5 with a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Subtracting 105 from 116 leaves us with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 21

Advancing to step 4:
21 goes into 119 5 times with a remainder of 14.
The next digit of our result is 5. 
Result so far: 455.0
If we subtract 105 from 119, we get 14.
Bring next digit (9) of the dividend behind the 14 and repeat the process: 149 / 21

Let's proceed to step 5:
When dividing 149 by 21, we get 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 4557.0
If we subtract 147 from 149, we get 2.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 21

Going ahead to step 6:
If we divide 26 by 21, we get 1 and a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 45571.0
If we take 21 away from 26, we end up 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.

Let's proceed to step 7:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 45571.2
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 8:
If we divide 80 by 21, we get 3 and a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 45571.23
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.

Going ahead to step 9:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 45571.238
Subtracting 168 from 170 leaves us 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.

Let's proceed to step 10:
When dividing 20 by 21, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 45571.238
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.

On to step 11:
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: 45571.23809
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 12:
If we divide 110 by 21, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 45571.238095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 13:
21 goes into 50 2 times with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 45571.2380952
Subtracting 42 from 50 leaves us 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.

Advancing to step 14:
80 divided by 21 is 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 45571.23809523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final outcome is 45571.23809523, with a leftover of 1.7e-08.