578629 ÷ 80 
The aim is to understand the frequency of 80 in 578629.

Step 1:
The number 80 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 80

On to step 2:
If we divide 57 by 80, we get 0 and a remainder of 57.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 57 and we're left with 57.
Include the next digit (8) from the dividend after 57, then repeat: 578 / 80

Let's proceed to step 3:
80 goes into 578 7 times with a remainder of 18.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Deduct 560 from 578 and we're left with 18.
Bring next digit (6) of the dividend behind the 18 and repeat the process: 186 / 80

Step 4:
80 can be fit into 186 2 times, resulting in a remainder of 26.
The next digit of our result is 2. 
Result so far: 72.0
Subtracting 160 from 186 leaves us with 26.
Include the next digit (2) from the dividend after 26, then repeat: 262 / 80

Moving on to step 5:
When dividing 262 by 80, we get 3 with a remainder of 22.
Record the quotient 3 as the next digit in the result. 
Result so far: 723.0
The remainder is 22 after subtracting 240 from 262.
Append the next digit (9) from the dividend to 22 and continue with: 229 / 80

Step 6:
80 goes into 229 2 times with a remainder of 69.
The number 2 becomes the next digit in our result. 
Result so far: 7232.0
If we take 160 away from 229, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 7:
The number 80 fits into 690 8 times, leaving a remainder of 50.
Use 8 as the next digit of our solution. 
Result so far: 7232.8
If we take 640 away from 690, we end up 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.

Let's proceed to step 8:
When dividing 500 by 80, we get 6 with a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 7232.86
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.

Going ahead to step 9:
When dividing 200 by 80, we get 2 with a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 7232.862
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.

Moving on to step 10:
When dividing 400 by 80, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 7232.8625
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.

Going ahead to step 11:
80 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 7232.8625
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 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 7232.8625
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.

Our division results in 7232.8625 with a remaining 0.0.