309261 divided by 20 
The aim is to understand the frequency of 20 in 309261.

On to step 1:
3 divided by 20 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 20

Let's proceed to step 2:
If we divide 30 by 20, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 20 from 30 to get 10.
Append the next digit (9) from the dividend to 10 and continue with: 109 / 20

Moving on to step 3:
20 can be fit into 109 5 times, resulting in a remainder of 9.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtracting 100 from 109 leaves us with 9.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 20

Step 4:
20 goes into 92 4 times with a remainder of 12.
The next digit of our result is 4. 
Result so far: 154.0
Deduct 80 from 92 and we're left with 12.
Append the next digit (6) from the dividend to 12 and continue with: 126 / 20

Moving on to step 5:
20 can be fit into 126 6 times, resulting in a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 1546.0
If we subtract 120 from 126, we get 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 20

Advancing to step 6:
20 can be fit into 61 3 times, resulting in a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 15463.0
If we subtract 60 from 61, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
20 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 15463.0
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.

On to step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 15463.05
Subtract 100 from 100 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 15463.05
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
If we divide 0 by 20, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 15463.05
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 15463.05 with a remainder of 0.0.