902405 ÷ 20 
The aim is to understand the frequency of 20 in 902405.

Going ahead to step 1:
20 can be fit into 9 0 times, resulting in a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 20

Going ahead to step 2:
20 goes into 90 4 times with a remainder of 10.
The next digit of our result is 4. 
Result so far: 4.0
If we take 80 away from 90, we end up with 10.
Take the next digit (2) from the dividend and append it to 10, then repeat: 102 / 20

On to step 3:
20 goes into 102 5 times with a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 45.0
Subtract 100 from 102 to get 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 20

Advancing to step 4:
If we divide 24 by 20, we get 1 and a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 451.0
If we take 20 away from 24, we end up with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 20

Step 5:
20 goes into 40 2 times with a remainder of 0.
The next digit of our result is 2. 
Result so far: 4512.0
Subtract 40 from 40 to get 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 20

Step 6:
If we divide 5 by 20, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 45120.0
Subtract 0 from 5 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
50 divided by 20 is 2 with a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 45120.2
If we subtract 40 from 50, we get 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:
20 goes into 100 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 45120.25
If we subtract 100 from 100, 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.

Let's proceed to step 9:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 45120.25
Subtracting 0 from 0 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.

Going ahead to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 45120.25
Subtracting 0 from 0 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.

The final result is 45120.25 with a remainder of 0.0.