869875 divided by 80 
The aim is to understand the frequency of 80 in 869875.

Step 1:
8 divided by 80 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 80

Moving on to step 2:
80 goes into 86 1 times with a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 80 from 86 to get 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 80

On to step 3:
69 divided by 80 is 0 with a remainder of 69.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we subtract 0 from 69, we get 69.
Take the next digit (8) from the dividend and append it to 69, then repeat: 698 / 80

Moving on to step 4:
When dividing 698 by 80, we get 8 with a remainder of 58.
Use 8 as the next digit of our solution. 
Result so far: 108.0
The remainder is 58 after subtracting 640 from 698.
Append the next digit (7) from the dividend to 58 and continue with: 587 / 80

Moving on to step 5:
If we divide 587 by 80, we get 7 and a remainder of 27.
The number 7 becomes the next digit in our result. 
Result so far: 1087.0
Subtract 560 from 587 to get 27.
Include the next digit (5) from the dividend after 27, then repeat: 275 / 80

On to step 6:
275 divided by 80 is 3 with a remainder of 35.
Use 3 as the next digit of our solution. 
Result so far: 10873.0
Deduct 240 from 275 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 7:
If we divide 350 by 80, we get 4 and a remainder of 30.
Record the quotient 4 as the next digit in the result. 
Result so far: 10873.4
If we take 320 away from 350, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 8:
If we divide 300 by 80, we get 3 and a remainder of 60.
The next digit of our result is 3. 
Result so far: 10873.43
The remainder is 60 after subtracting 240 from 300.
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:
80 can be fit into 600 7 times, resulting in a remainder of 40.
The next digit of our result is 7. 
Result so far: 10873.437
Deduct 560 from 600 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.

Step 10:
When dividing 400 by 80, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10873.4375
The remainder is 0 after subtracting 400 from 400.
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:
0 divided by 80 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10873.4375
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.

Advancing to step 12:
If we divide 0 by 80, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10873.4375
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.

Our division results in 10873.4375 with a remaining 0.0.