825573 ÷ 80 
The aim is to understand the frequency of 80 in 825573.

Going ahead to step 1:
If we divide 8 by 80, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (2) of the dividend behind the 8 and repeat the process: 82 / 80

Step 2:
The number 80 fits into 82 1 times, leaving a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 80 from 82 to get 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 80

Step 3:
25 divided by 80 is 0 with a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtract 0 from 25 to get 25.
Grab the next digit (5) from the dividend, add it to 25, then carry on: 255 / 80

On to step 4:
80 goes into 255 3 times with a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 103.0
Deduct 240 from 255 and we're left with 15.
Bring next digit (7) of the dividend behind the 15 and repeat the process: 157 / 80

Step 5:
80 can be fit into 157 1 times, resulting in a remainder of 77.
Use 1 as the next digit of our solution. 
Result so far: 1031.0
If we take 80 away from 157, we end up with 77.
Grab the next digit (3) from the dividend, add it to 77, then carry on: 773 / 80

On to step 6:
80 goes into 773 9 times with a remainder of 53.
Put 9 as the next digit of the answer. 
Result so far: 10319.0
If we take 720 away from 773, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 7:
530 divided by 80 is 6 with a remainder of 50.
The next digit of our result is 6. 
Result so far: 10319.6
Subtract 480 from 530 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 8:
The number 80 fits into 500 6 times, leaving a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 10319.66
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.

The quotient of the division is 10319.66, and the remainder is 0.02.