Let's divide 10815 by 20
The aim is to understand the frequency of 20 in 10815.

Going ahead to step 1:
1 divided by 20 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 20

Step 2:
20 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Grab the next digit (8) from the dividend, add it to 10, then carry on: 108 / 20

Going ahead to step 3:
The number 20 fits into 108 5 times, leaving a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 100 from 108 and we're left with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 20

Going ahead to step 4:
20 can be fit into 81 4 times, resulting in a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 54.0
Deduct 80 from 81 and we're left with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 20

Advancing to step 5:
20 goes into 15 0 times with a remainder of 15.
The next digit of our result is 0. 
Result so far: 540.0
Subtracting 0 from 15 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 6:
150 divided by 20 is 7 with a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 540.7
If we take 140 away from 150, 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 7:
20 goes into 100 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 540.75
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.

Moving on to step 8:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 540.75
If we take 0 away from 0, we end up 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.

Moving on to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 540.75
If we take 0 away from 0, we end up 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 quotient of the division is 540.75, and the remainder is 0.0.