866223 divided by 66 
The aim is to understand the frequency of 66 in 866223.

Moving on to step 1:
66 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 66

Moving on to step 2:
86 divided by 66 is 1 with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 66 from 86 leaves us with 20.
Bring next digit (6) of the dividend behind the 20 and repeat the process: 206 / 66

On to step 3:
66 can be fit into 206 3 times, resulting in a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtracting 198 from 206 leaves us with 8.
Take the next digit (2) from the dividend and append it to 8, then repeat: 82 / 66

Step 4:
66 can be fit into 82 1 times, resulting in a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 131.0
Subtracting 66 from 82 leaves us with 16.
Grab the next digit (2) from the dividend, add it to 16, then carry on: 162 / 66

Step 5:
66 goes into 162 2 times with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 1312.0
The remainder is 30 after subtracting 132 from 162.
Append the next digit (3) from the dividend to 30 and continue with: 303 / 66

Going ahead to step 6:
When dividing 303 by 66, we get 4 with a remainder of 39.
Put 4 as the next digit of the answer. 
Result so far: 13124.0
Deduct 264 from 303 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 7:
The number 66 fits into 390 5 times, leaving a remainder of 60.
The next digit of our result is 5. 
Result so far: 13124.5
The remainder is 60 after subtracting 330 from 390.
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:
600 divided by 66 is 9 with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 13124.59
Deduct 594 from 600 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 9:
When dividing 60 by 66, we get 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 13124.59
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 10:
66 goes into 600 9 times with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 13124.5909
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
60 divided by 66 is 0 with a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 13124.5909
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 12:
The number 66 fits into 600 9 times, leaving a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 13124.590909
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 13:
If we divide 60 by 66, we get 0 and a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 13124.590909
Subtract 0 from 60 to get 60.
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 14:
66 goes into 600 9 times with a remainder of 6.
The next digit of our result is 9. 
Result so far: 13124.59090909
If we take 594 away from 600, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The quotient of the division is 13124.59090909, and the remainder is 6e-09.