78247963 ÷ 80 
The aim is to understand the frequency of 80 in 78247963.

Advancing to step 1:
If we divide 7 by 80, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 80

Step 2:
When dividing 78 by 80, we get 0 with a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Grab the next digit (2) from the dividend, add it to 78, then carry on: 782 / 80

Going ahead to step 3:
782 divided by 80 is 9 with a remainder of 62.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we subtract 720 from 782, we get 62.
Bring next digit (4) of the dividend behind the 62 and repeat the process: 624 / 80

Moving on to step 4:
80 can be fit into 624 7 times, resulting in a remainder of 64.
Write down 7 as next digit of the result. 
Result so far: 97.0
Subtract 560 from 624 to get 64.
Take the next digit (7) from the dividend and append it to 64, then repeat: 647 / 80

Let's proceed to step 5:
If we divide 647 by 80, we get 8 and a remainder of 7.
The number 8 becomes the next digit in our result. 
Result so far: 978.0
Deduct 640 from 647 and we're left with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 80

Moving on to step 6:
If we divide 79 by 80, we get 0 and a remainder of 79.
Record the quotient 0 as the next digit in the result. 
Result so far: 9780.0
If we take 0 away from 79, we end up with 79.
Take the next digit (6) from the dividend and append it to 79, then repeat: 796 / 80

Advancing to step 7:
If we divide 796 by 80, we get 9 and a remainder of 76.
Put 9 as the next digit of the answer. 
Result so far: 97809.0
Subtract 720 from 796 to get 76.
Fetch the next digit (3) from the dividend, attach it to 76 and continue: 763 / 80

Going ahead to step 8:
80 goes into 763 9 times with a remainder of 43.
Record the quotient 9 as the next digit in the result. 
Result so far: 978099.0
The remainder is 43 after subtracting 720 from 763.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 9:
When dividing 430 by 80, we get 5 with a remainder of 30.
The next digit of our result is 5. 
Result so far: 978099.5
If we subtract 400 from 430, 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.

Let's proceed to step 10:
When dividing 300 by 80, we get 3 with a remainder of 60.
Record the quotient 3 as the next digit in the result. 
Result so far: 978099.53
If we take 240 away from 300, we end up 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 11:
600 divided by 80 is 7 with a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 978099.537
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 12:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 978099.5375
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.

Let's proceed to step 13:
If we divide 0 by 80, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 978099.5375
The remainder is 0 after subtracting 0 from 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:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 978099.5375
Deduct 0 from 0 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.

After the division, we end up with 978099.5375 and a remainder of 0.0.