953960 ÷ 21 
The aim is to understand the frequency of 21 in 953960.

Going ahead to step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (5) from the dividend, attach it to 9 and continue: 95 / 21

On to step 2:
When dividing 95 by 21, we get 4 with a remainder of 11.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 84 from 95 leaves us with 11.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 21

Advancing to step 3:
When dividing 113 by 21, we get 5 with a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 45.0
If we subtract 105 from 113, we get 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 21

Going ahead to step 4:
The number 21 fits into 89 4 times, leaving a remainder of 5.
Record the quotient 4 as the next digit in the result. 
Result so far: 454.0
The remainder is 5 after subtracting 84 from 89.
Fetch the next digit (6) from the dividend, attach it to 5 and continue: 56 / 21

Going ahead to step 5:
21 goes into 56 2 times with a remainder of 14.
The number 2 becomes the next digit in our result. 
Result so far: 4542.0
If we take 42 away from 56, we end up with 14.
Take the next digit (0) from the dividend and append it to 14, then repeat: 140 / 21

Advancing to step 6:
When dividing 140 by 21, we get 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 45426.0
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
21 goes into 140 6 times with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 45426.6
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
The number 21 fits into 140 6 times, leaving a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 45426.66
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 45426.66 with a remainder of 0.014.