990963 ÷ 80 
The aim is to understand the frequency of 80 in 990963.

On to step 1:
The number 80 fits into 9 0 times, leaving a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 80

Moving on to step 2:
The number 80 fits into 99 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 80 from 99 leaves us with 19.
Bring next digit (0) of the dividend behind the 19 and repeat the process: 190 / 80

Moving on to step 3:
80 goes into 190 2 times with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtracting 160 from 190 leaves us with 30.
Fetch the next digit (9) from the dividend, attach it to 30 and continue: 309 / 80

Going ahead to step 4:
80 goes into 309 3 times with a remainder of 69.
The next digit of our result is 3. 
Result so far: 123.0
If we take 240 away from 309, we end up with 69.
Bring next digit (6) of the dividend behind the 69 and repeat the process: 696 / 80

Advancing to step 5:
696 divided by 80 is 8 with a remainder of 56.
Write down 8 as next digit of the result. 
Result so far: 1238.0
Subtracting 640 from 696 leaves us with 56.
Append the next digit (3) from the dividend to 56 and continue with: 563 / 80

Advancing to step 6:
563 divided by 80 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 12387.0
Subtracting 560 from 563 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
If we divide 30 by 80, we get 0 and a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 12387.0
Subtracting 0 from 30 leaves us with 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 8:
300 divided by 80 is 3 with a remainder of 60.
The next digit of our result is 3. 
Result so far: 12387.03
Subtracting 240 from 300 leaves us 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.

Going ahead to step 9:
If we divide 600 by 80, we get 7 and a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 12387.037
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 10:
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: 12387.0375
Subtracting 400 from 400 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.

On to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 12387.0375
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.

On to step 12:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12387.0375
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.

The final outcome is 12387.0375, with a leftover of 0.0.