243851 ÷ 80 
The aim is to understand the frequency of 80 in 243851.

Let's proceed to step 1:
When dividing 2 by 80, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 80

Step 2:
80 goes into 24 0 times with a remainder of 24.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 24, we end up with 24.
Include the next digit (3) from the dividend after 24, then repeat: 243 / 80

Going ahead to step 3:
When dividing 243 by 80, we get 3 with a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 240 from 243 leaves us with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 80

Moving on to step 4:
80 can be fit into 38 0 times, resulting in a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
If we take 0 away from 38, we end up with 38.
Append the next digit (5) from the dividend to 38 and continue with: 385 / 80

Let's proceed to step 5:
When dividing 385 by 80, we get 4 with a remainder of 65.
Write down 4 as next digit of the result. 
Result so far: 304.0
Deduct 320 from 385 and we're left with 65.
Append the next digit (1) from the dividend to 65 and continue with: 651 / 80

Moving on to step 6:
80 goes into 651 8 times with a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 3048.0
Deduct 640 from 651 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
If we divide 110 by 80, we get 1 and a remainder of 30.
Use 1 as the next digit of our solution. 
Result so far: 3048.1
If we subtract 80 from 110, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
80 can be fit into 300 3 times, resulting in a remainder of 60.
Use 3 as the next digit of our solution. 
Result so far: 3048.13
Subtracting 240 from 300 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 9:
The number 80 fits into 600 7 times, leaving a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 3048.137
Subtracting 560 from 600 leaves us 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.

Let's proceed to step 10:
If we divide 400 by 80, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 3048.1375
If we take 400 away from 400, 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.

Moving on to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 3048.1375
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.

Going ahead to step 12:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 3048.1375
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.

Our division results in 3048.1375 with a remaining 0.0.