We look at the division of 240405 by 20 
The aim is to understand the frequency of 20 in 240405.

Let's proceed to step 1:
20 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.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 20

Step 2:
The number 20 fits into 24 1 times, leaving a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 20 from 24 to get 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 20

Advancing to step 3:
20 goes into 40 2 times with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 40 from 40 and we're left with 0.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 20

Step 4:
When dividing 4 by 20, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 120.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 20

Going ahead to step 5:
20 can be fit into 40 2 times, resulting in a remainder of 0.
The next digit of our result is 2. 
Result so far: 1202.0
Subtracting 40 from 40 leaves us with 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 20

On to step 6:
5 divided by 20 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 12020.0
Subtracting 0 from 5 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 7:
20 goes into 50 2 times with a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 12020.2
If we take 40 away from 50, 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.

Advancing to 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: 12020.25
Subtracting 100 from 100 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
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: 12020.25
Deduct 0 from 0 and we're left with 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:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 12020.25
Deduct 0 from 0 and we're left with 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 outcome is 12020.25, with a leftover of 0.0.