Let's divide 991863 by 12
The aim is to understand the frequency of 12 in 991863.

Advancing to step 1:
9 divided by 12 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 12

Moving on to step 2:
When dividing 99 by 12, we get 8 with a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 96 from 99 to get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 12

Advancing to step 3:
The number 12 fits into 31 2 times, leaving a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 82.0
Subtracting 24 from 31 leaves us with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 12

Advancing to step 4:
12 goes into 78 6 times with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 826.0
If we subtract 72 from 78, we get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 12

On to step 5:
If we divide 66 by 12, we get 5 and a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 8265.0
If we take 60 away from 66, we end up with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 12

Going ahead to step 6:
12 can be fit into 63 5 times, resulting in a remainder of 3.
Put 5 as the next digit of the answer. 
Result so far: 82655.0
Subtracting 60 from 63 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:
12 goes into 30 2 times with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 82655.2
The remainder is 6 after subtracting 24 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
12 goes into 60 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 82655.25
The remainder is 0 after subtracting 60 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
12 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 82655.25
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.

Step 10:
12 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 82655.25
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 82655.25, with a leftover of 0.0.