840863 ÷ 66 
The aim is to understand the frequency of 66 in 840863.

Step 1:
If we divide 8 by 66, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 66

On to step 2:
When dividing 84 by 66, we get 1 with a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 66 from 84 leaves us with 18.
Bring next digit (0) of the dividend behind the 18 and repeat the process: 180 / 66

Let's proceed to step 3:
66 goes into 180 2 times with a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtracting 132 from 180 leaves us with 48.
Bring next digit (8) of the dividend behind the 48 and repeat the process: 488 / 66

On to step 4:
488 divided by 66 is 7 with a remainder of 26.
Put 7 as the next digit of the answer. 
Result so far: 127.0
If we subtract 462 from 488, we get 26.
Include the next digit (6) from the dividend after 26, then repeat: 266 / 66

Moving on to step 5:
66 can be fit into 266 4 times, resulting in a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 1274.0
If we subtract 264 from 266, we get 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 66

Going ahead to step 6:
23 divided by 66 is 0 with a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 12740.0
If we subtract 0 from 23, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 7:
When dividing 230 by 66, we get 3 with a remainder of 32.
Put 3 as the next digit of the answer. 
Result so far: 12740.3
If we take 198 away from 230, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 8:
If we divide 320 by 66, we get 4 and a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 12740.34
Subtract 264 from 320 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 9:
The number 66 fits into 560 8 times, leaving a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 12740.348
The remainder is 32 after subtracting 528 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 10:
If we divide 320 by 66, we get 4 and a remainder of 56.
The next digit of our result is 4. 
Result so far: 12740.3484
Subtracting 264 from 320 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 11:
66 can be fit into 560 8 times, resulting in a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 12740.34848
Subtracting 528 from 560 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 12:
The number 66 fits into 320 4 times, leaving a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 12740.348484
The remainder is 56 after subtracting 264 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 13:
66 can be fit into 560 8 times, resulting in a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 12740.3484848
The remainder is 32 after subtracting 528 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 14:
66 goes into 320 4 times with a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 12740.34848484
If we subtract 264 from 320, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

In conclusion, the division gives 12740.34848484 with a balance of 5.6e-08.