We're dividing 230946 by 21 
The aim is to understand the frequency of 21 in 230946.

Moving on to step 1:
When dividing 2 by 21, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 21

Moving on to step 2:
The number 21 fits into 23 1 times, leaving a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 21 from 23 and we're left with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 21

Advancing to step 3:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 10.0
Deduct 0 from 20 and we're left with 20.
Grab the next digit (9) from the dividend, add it to 20, then carry on: 209 / 21

On to step 4:
When dividing 209 by 21, we get 9 with a remainder of 20.
Use 9 as the next digit of our solution. 
Result so far: 109.0
The remainder is 20 after subtracting 189 from 209.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 21

Advancing to step 5:
When dividing 204 by 21, we get 9 with a remainder of 15.
The number 9 becomes the next digit in our result. 
Result so far: 1099.0
Deduct 189 from 204 and we're left with 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 21

Step 6:
21 can be fit into 156 7 times, resulting in a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 10997.0
The remainder is 9 after subtracting 147 from 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
If we divide 90 by 21, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 10997.4
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 10997.42
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 9:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 10997.428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 10:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 10997.4285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 11:
21 can be fit into 150 7 times, resulting in a remainder of 3.
The next digit of our result is 7. 
Result so far: 10997.42857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 12:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 10997.428571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 13:
90 divided by 21 is 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 10997.4285714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The next digit of our result is 2. 
Result so far: 10997.42857142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The quotient of the division is 10997.42857142, and the remainder is 1.8e-08.