591894 ÷ 80 
The aim is to understand the frequency of 80 in 591894.

Step 1:
When dividing 5 by 80, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 80

Advancing to step 2:
80 can be fit into 59 0 times, resulting in a remainder of 59.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 59 to get 59.
Grab the next digit (1) from the dividend, add it to 59, then carry on: 591 / 80

Going ahead to step 3:
When dividing 591 by 80, we get 7 with a remainder of 31.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
The remainder is 31 after subtracting 560 from 591.
Append the next digit (8) from the dividend to 31 and continue with: 318 / 80

Moving on to step 4:
80 can be fit into 318 3 times, resulting in a remainder of 78.
Record the quotient 3 as the next digit in the result. 
Result so far: 73.0
Subtracting 240 from 318 leaves us with 78.
Include the next digit (9) from the dividend after 78, then repeat: 789 / 80

On to step 5:
80 can be fit into 789 9 times, resulting in a remainder of 69.
Put 9 as the next digit of the answer. 
Result so far: 739.0
Subtracting 720 from 789 leaves us with 69.
Take the next digit (4) from the dividend and append it to 69, then repeat: 694 / 80

Advancing to step 6:
80 goes into 694 8 times with a remainder of 54.
Write down 8 as next digit of the result. 
Result so far: 7398.0
The remainder is 54 after subtracting 640 from 694.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 7:
540 divided by 80 is 6 with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 7398.6
The remainder is 60 after subtracting 480 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 8:
The number 80 fits into 600 7 times, leaving a remainder of 40.
The next digit of our result is 7. 
Result so far: 7398.67
The remainder is 40 after subtracting 560 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 9:
400 divided by 80 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 7398.675
If we take 400 away from 400, 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.

On to step 10:
0 divided by 80 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7398.675
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.

On to step 11:
0 divided by 80 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7398.675
Subtracting 0 from 0 leaves us 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 final outcome is 7398.675, with a leftover of 0.0.