We divide 990519 by 20
The aim is to understand the frequency of 20 in 990519.

Moving on to step 1:
When dividing 9 by 20, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 20

Step 2:
The number 20 fits into 99 4 times, leaving a remainder of 19.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 80 from 99 to get 19.
Fetch the next digit (0) from the dividend, attach it to 19 and continue: 190 / 20

Advancing to step 3:
If we divide 190 by 20, we get 9 and a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 49.0
If we subtract 180 from 190, we get 10.
Append the next digit (5) from the dividend to 10 and continue with: 105 / 20

Step 4:
The number 20 fits into 105 5 times, leaving a remainder of 5.
The next digit of our result is 5. 
Result so far: 495.0
The remainder is 5 after subtracting 100 from 105.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 20

Step 5:
When dividing 51 by 20, we get 2 with a remainder of 11.
The next digit of our result is 2. 
Result so far: 4952.0
Deduct 40 from 51 and we're left with 11.
Take the next digit (9) from the dividend and append it to 11, then repeat: 119 / 20

Step 6:
If we divide 119 by 20, we get 5 and a remainder of 19.
The number 5 becomes the next digit in our result. 
Result so far: 49525.0
If we subtract 100 from 119, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
20 goes into 190 9 times with a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 49525.9
Deduct 180 from 190 and we're left 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:
100 divided by 20 is 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 49525.95
The remainder is 0 after subtracting 100 from 100.
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:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 49525.95
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.

Let's proceed to step 10:
20 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 49525.95
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 result is 49525.95 with a remainder of 0.0.