223434 ÷ 21 
The aim is to understand the frequency of 21 in 223434.

On to step 1:
21 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 21

Moving on to step 2:
The number 21 fits into 22 1 times, leaving a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 1 after subtracting 21 from 22.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 21

Going ahead to step 3:
The number 21 fits into 13 0 times, leaving a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
If we subtract 0 from 13, we get 13.
Bring next digit (4) of the dividend behind the 13 and repeat the process: 134 / 21

Going ahead to step 4:
When dividing 134 by 21, we get 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 106.0
Subtracting 126 from 134 leaves us with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 21

Let's proceed to step 5:
21 goes into 83 3 times with a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 1063.0
Subtracting 63 from 83 leaves us with 20.
Fetch the next digit (4) from the dividend, attach it to 20 and continue: 204 / 21

Going ahead to step 6:
When dividing 204 by 21, we get 9 with a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 10639.0
The remainder is 15 after subtracting 189 from 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
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: 10639.7
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 8:
If we divide 30 by 21, we get 1 and a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 10639.71
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 9:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 10639.714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 10:
21 goes into 60 2 times with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 10639.7142
Subtracting 42 from 60 leaves us 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.

Going ahead to step 11:
If we divide 180 by 21, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 10639.71428
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.

Let's proceed to step 12:
If we divide 120 by 21, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 10639.714285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 13:
When dividing 150 by 21, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 10639.7142857
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.

Advancing to step 14:
21 goes into 30 1 times with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 10639.71428571
If we take 21 away from 30, we end up 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.

In conclusion, the division gives 10639.71428571 with a balance of 9e-09.