Let's divide 959603 by 21
The aim is to understand the frequency of 21 in 959603.

Step 1:
21 can be fit into 9 0 times, resulting in a remainder of 9.
Put 0 as the next digit of the answer. 
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

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
Deduct 84 from 95 and we're left with 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 21

Going ahead to step 3:
If we divide 119 by 21, we get 5 and a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 45.0
If we subtract 105 from 119, we get 14.
Grab the next digit (6) from the dividend, add it to 14, then carry on: 146 / 21

Advancing to step 4:
The number 21 fits into 146 6 times, leaving a remainder of 20.
The next digit of our result is 6. 
Result so far: 456.0
If we subtract 126 from 146, we get 20.
Append the next digit (0) from the dividend to 20 and continue with: 200 / 21

Going ahead to step 5:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 4569.0
Subtracting 189 from 200 leaves us with 11.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 21

Let's proceed to step 6:
If we divide 113 by 21, we get 5 and a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 45695.0
The remainder is 8 after subtracting 105 from 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 7:
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: 45695.3
Subtract 63 from 80 to 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.

Let's proceed to step 8:
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: 45695.38
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.

Advancing to step 9:
20 divided by 21 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 45695.38
If we take 0 away from 20, we end up 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.

Advancing to step 10:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 45695.3809
The remainder is 11 after subtracting 189 from 200.
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 11:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 45695.38095
Subtract 105 from 110 to 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.

Step 12:
When dividing 50 by 21, we get 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 45695.380952
If we take 42 away from 50, we end up 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 13:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 45695.3809523
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 14:
170 divided by 21 is 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 45695.38095238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

In conclusion, the division gives 45695.38095238 with a balance of 2e-09.