Let's divide 398909 by 80
The aim is to understand the frequency of 80 in 398909.

Moving on to step 1:
If we divide 3 by 80, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 80

On to step 2:
If we divide 39 by 80, we get 0 and a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Fetch the next digit (8) from the dividend, attach it to 39 and continue: 398 / 80

Let's proceed to step 3:
When dividing 398 by 80, we get 4 with a remainder of 78.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 320 away from 398, we end up with 78.
Grab the next digit (9) from the dividend, add it to 78, then carry on: 789 / 80

Step 4:
The number 80 fits into 789 9 times, leaving a remainder of 69.
Put 9 as the next digit of the answer. 
Result so far: 49.0
Deduct 720 from 789 and we're left with 69.
Take the next digit (0) from the dividend and append it to 69, then repeat: 690 / 80

On to step 5:
690 divided by 80 is 8 with a remainder of 50.
The next digit of our result is 8. 
Result so far: 498.0
The remainder is 50 after subtracting 640 from 690.
Grab the next digit (9) from the dividend, add it to 50, then carry on: 509 / 80

On to step 6:
509 divided by 80 is 6 with a remainder of 29.
Use 6 as the next digit of our solution. 
Result so far: 4986.0
If we take 480 away from 509, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 7:
80 can be fit into 290 3 times, resulting in a remainder of 50.
The number 3 becomes the next digit in our result. 
Result so far: 4986.3
Deduct 240 from 290 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 8:
500 divided by 80 is 6 with a remainder of 20.
The next digit of our result is 6. 
Result so far: 4986.36
Deduct 480 from 500 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
When dividing 200 by 80, we get 2 with a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 4986.362
Deduct 160 from 200 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 10:
80 goes into 400 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 4986.3625
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.

Advancing to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4986.3625
Subtract 0 from 0 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.

Going ahead to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4986.3625
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.

The final result is 4986.3625 with a remainder of 0.0.