We're dividing 303988 by 80 
The aim is to understand the frequency of 80 in 303988.

On to step 1:
3 divided by 80 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 80

Step 2:
80 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Include the next digit (3) from the dividend after 30, then repeat: 303 / 80

On to step 3:
The number 80 fits into 303 3 times, leaving a remainder of 63.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 240 from 303 leaves us with 63.
Include the next digit (9) from the dividend after 63, then repeat: 639 / 80

On to step 4:
80 can be fit into 639 7 times, resulting in a remainder of 79.
The number 7 becomes the next digit in our result. 
Result so far: 37.0
Deduct 560 from 639 and we're left with 79.
Append the next digit (8) from the dividend to 79 and continue with: 798 / 80

Advancing to step 5:
When dividing 798 by 80, we get 9 with a remainder of 78.
The number 9 becomes the next digit in our result. 
Result so far: 379.0
Subtracting 720 from 798 leaves us with 78.
Append the next digit (8) from the dividend to 78 and continue with: 788 / 80

Advancing to step 6:
788 divided by 80 is 9 with a remainder of 68.
The number 9 becomes the next digit in our result. 
Result so far: 3799.0
Subtracting 720 from 788 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Going ahead to step 7:
If we divide 680 by 80, we get 8 and a remainder of 40.
The next digit of our result is 8. 
Result so far: 3799.8
Deduct 640 from 680 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 3799.85
If we subtract 400 from 400, 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 9:
80 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 3799.85
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.

Going ahead to step 10:
80 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3799.85
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 outcome is 3799.85, with a leftover of 0.0.