We're dividing 309711 by 20 
The aim is to understand the frequency of 20 in 309711.

Going ahead to step 1:
20 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 20

Moving on to step 2:
The number 20 fits into 30 1 times, leaving a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 20 away from 30, we end up with 10.
Append the next digit (9) from the dividend to 10 and continue with: 109 / 20

Let's proceed to step 3:
20 can be fit into 109 5 times, resulting in a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtract 100 from 109 to get 9.
Append the next digit (7) from the dividend to 9 and continue with: 97 / 20

Step 4:
The number 20 fits into 97 4 times, leaving a remainder of 17.
Write down 4 as next digit of the result. 
Result so far: 154.0
If we take 80 away from 97, we end up with 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 20

Going ahead to step 5:
The number 20 fits into 171 8 times, leaving a remainder of 11.
Put 8 as the next digit of the answer. 
Result so far: 1548.0
The remainder is 11 after subtracting 160 from 171.
Include the next digit (1) from the dividend after 11, then repeat: 111 / 20

Step 6:
If we divide 111 by 20, we get 5 and a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 15485.0
If we subtract 100 from 111, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
20 goes into 110 5 times with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 15485.5
If we take 100 away from 110, 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 8:
100 divided by 20 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 15485.55
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.

Our division results in 15485.55 with a remaining 0.0.