800866 divided by 12 
The aim is to understand the frequency of 12 in 800866.

Let's proceed to step 1:
If we divide 8 by 12, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 12

On to step 2:
The number 12 fits into 80 6 times, leaving a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 8 after subtracting 72 from 80.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 12

Step 3:
12 can be fit into 80 6 times, resulting in a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 66.0
Deduct 72 from 80 and we're left with 8.
Grab the next digit (8) from the dividend, add it to 8, then carry on: 88 / 12

Step 4:
12 can be fit into 88 7 times, resulting in a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 667.0
If we take 84 away from 88, we end up with 4.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 12

Advancing to step 5:
46 divided by 12 is 3 with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 6673.0
If we subtract 36 from 46, we get 10.
Include the next digit (6) from the dividend after 10, then repeat: 106 / 12

Moving on to step 6:
12 can be fit into 106 8 times, resulting in a remainder of 10.
The next digit of our result is 8. 
Result so far: 66738.0
If we take 96 away from 106, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
12 goes into 100 8 times with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 66738.8
Subtract 96 from 100 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
When dividing 40 by 12, we get 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 66738.83
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 66738.833
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Our division results in 66738.833 with a remaining 0.0004.