We're dividing 801243 by 20 
The aim is to understand the frequency of 20 in 801243.

Going ahead to step 1:
20 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 20

Let's proceed to step 2:
If we divide 80 by 20, we get 4 and a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Deduct 80 from 80 and we're left with 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 20

Moving on to step 3:
20 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 40.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 20

Advancing to step 4:
20 goes into 12 0 times with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 400.0
If we subtract 0 from 12, we get 12.
Take the next digit (4) from the dividend and append it to 12, then repeat: 124 / 20

On to step 5:
124 divided by 20 is 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 4006.0
Deduct 120 from 124 and we're left with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 20

On to step 6:
The number 20 fits into 43 2 times, leaving a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 40062.0
Deduct 40 from 43 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
30 divided by 20 is 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 40062.1
Deduct 20 from 30 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.

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: 40062.15
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.

Going ahead to step 9:
20 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 40062.15
If we subtract 0 from 0, 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.

On to step 10:
If we divide 0 by 20, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 40062.15
The remainder is 0 after subtracting 0 from 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 40062.15, with a leftover of 0.0.