We divide 86458873 by 80
The aim is to understand the frequency of 80 in 86458873.

On to step 1:
8 divided by 80 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 80

Let's proceed to step 2:
When dividing 86 by 80, we get 1 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 (4) of the dividend behind the 6 and repeat the process: 64 / 80

Moving on to step 3:
80 goes into 64 0 times with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 64 to get 64.
Fetch the next digit (5) from the dividend, attach it to 64 and continue: 645 / 80

Advancing to step 4:
80 goes into 645 8 times with a remainder of 5.
Record the quotient 8 as the next digit in the result. 
Result so far: 108.0
Deduct 640 from 645 and we're left with 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 80

Advancing to step 5:
58 divided by 80 is 0 with a remainder of 58.
Write down 0 as next digit of the result. 
Result so far: 1080.0
Subtracting 0 from 58 leaves us with 58.
Append the next digit (8) from the dividend to 58 and continue with: 588 / 80

Moving on to step 6:
80 can be fit into 588 7 times, resulting in a remainder of 28.
Record the quotient 7 as the next digit in the result. 
Result so far: 10807.0
If we subtract 560 from 588, we get 28.
Bring next digit (7) of the dividend behind the 28 and repeat the process: 287 / 80

Step 7:
80 goes into 287 3 times with a remainder of 47.
The next digit of our result is 3. 
Result so far: 108073.0
Deduct 240 from 287 and we're left with 47.
Fetch the next digit (3) from the dividend, attach it to 47 and continue: 473 / 80

Step 8:
If we divide 473 by 80, we get 5 and a remainder of 73.
The number 5 becomes the next digit in our result. 
Result so far: 1080735.0
Deduct 400 from 473 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 9:
730 divided by 80 is 9 with a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 1080735.9
Deduct 720 from 730 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.

Going ahead to step 10:
100 divided by 80 is 1 with a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 1080735.91
Subtracting 80 from 100 leaves us 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.

Let's proceed to step 11:
The number 80 fits into 200 2 times, leaving a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 1080735.912
Subtract 160 from 200 to get 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 12:
If we divide 400 by 80, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 1080735.9125
Deduct 400 from 400 and we're left 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.

Let's proceed to step 13:
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: 1080735.9125
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.

Going ahead to step 14:
80 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1080735.9125
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.

The quotient of the division is 1080735.9125, and the remainder is 0.0.