We look at the division of 353049 by 20 
The aim is to understand the frequency of 20 in 353049.

Advancing to step 1:
20 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 20

Let's proceed to step 2:
If we divide 35 by 20, we get 1 and a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 20 from 35 leaves us with 15.
Grab the next digit (3) from the dividend, add it to 15, then carry on: 153 / 20

On to step 3:
The number 20 fits into 153 7 times, leaving a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
The remainder is 13 after subtracting 140 from 153.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 20

On to step 4:
The number 20 fits into 130 6 times, leaving a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 176.0
Deduct 120 from 130 and we're left with 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 20

Step 5:
20 goes into 104 5 times with a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 1765.0
Subtracting 100 from 104 leaves us with 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 20

Advancing to step 6:
20 can be fit into 49 2 times, resulting in a remainder of 9.
The next digit of our result is 2. 
Result so far: 17652.0
Deduct 40 from 49 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
90 divided by 20 is 4 with a remainder of 10.
The next digit of our result is 4. 
Result so far: 17652.4
If we take 80 away from 90, 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.

Moving on to step 8:
100 divided by 20 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 17652.45
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.

Advancing to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 17652.45
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.

Advancing to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 17652.45
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 quotient of the division is 17652.45, and the remainder is 0.0.