We're dividing 342844 by 21 
The aim is to understand the frequency of 21 in 342844.

Moving on to step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 21

Moving on to step 2:
21 can be fit into 34 1 times, resulting in a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 21 from 34 leaves us with 13.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 21

Going ahead to step 3:
21 can be fit into 132 6 times, resulting in a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 16.0
The remainder is 6 after subtracting 126 from 132.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 21

Going ahead to step 4:
The number 21 fits into 68 3 times, leaving a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 163.0
Subtracting 63 from 68 leaves us with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 21

Advancing to step 5:
21 goes into 54 2 times with a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 1632.0
If we subtract 42 from 54, we get 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 21

On to step 6:
When dividing 124 by 21, we get 5 with a remainder of 19.
Record the quotient 5 as the next digit in the result. 
Result so far: 16325.0
The remainder is 19 after subtracting 105 from 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 7:
If we divide 190 by 21, we get 9 and a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 16325.9
Subtracting 189 from 190 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 8:
10 divided by 21 is 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 16325.9
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
21 goes into 100 4 times with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 16325.904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 10:
If we divide 160 by 21, we get 7 and a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 16325.9047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 11:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 16325.90476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
21 can be fit into 40 1 times, resulting in a remainder of 19.
The next digit of our result is 1. 
Result so far: 16325.904761
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 13:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 16325.9047619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 14:
21 goes into 10 0 times with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 16325.9047619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 16325.9047619 with a remaining 1e-08.