869133 ÷ 66 
The aim is to understand the frequency of 66 in 869133.

Step 1:
The number 66 fits into 8 0 times, leaving 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.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 66

Advancing to step 2:
86 divided by 66 is 1 with a remainder of 20.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 66 from 86 to get 20.
Append the next digit (9) from the dividend to 20 and continue with: 209 / 66

Moving on to step 3:
If we divide 209 by 66, we get 3 and a remainder of 11.
The next digit of our result is 3. 
Result so far: 13.0
Deduct 198 from 209 and we're left with 11.
Grab the next digit (1) from the dividend, add it to 11, then carry on: 111 / 66

Going ahead to step 4:
If we divide 111 by 66, we get 1 and a remainder of 45.
Put 1 as the next digit of the answer. 
Result so far: 131.0
Deduct 66 from 111 and we're left with 45.
Fetch the next digit (3) from the dividend, attach it to 45 and continue: 453 / 66

Advancing to step 5:
The number 66 fits into 453 6 times, leaving a remainder of 57.
Put 6 as the next digit of the answer. 
Result so far: 1316.0
If we take 396 away from 453, we end up with 57.
Include the next digit (3) from the dividend after 57, then repeat: 573 / 66

On to step 6:
573 divided by 66 is 8 with a remainder of 45.
The next digit of our result is 8. 
Result so far: 13168.0
Subtracting 528 from 573 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 7:
The number 66 fits into 450 6 times, leaving a remainder of 54.
Use 6 as the next digit of our solution. 
Result so far: 13168.6
Subtracting 396 from 450 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 8:
540 divided by 66 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 13168.68
If we take 528 away from 540, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
66 goes into 120 1 times with a remainder of 54.
The next digit of our result is 1. 
Result so far: 13168.681
If we subtract 66 from 120, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 10:
66 can be fit into 540 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 13168.6818
Subtract 528 from 540 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 11:
120 divided by 66 is 1 with a remainder of 54.
The number 1 becomes the next digit in our result. 
Result so far: 13168.68181
Subtracting 66 from 120 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 12:
If we divide 540 by 66, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 13168.681818
Deduct 528 from 540 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 13:
The number 66 fits into 120 1 times, leaving a remainder of 54.
Write down 1 as next digit of the result. 
Result so far: 13168.6818181
Deduct 66 from 120 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 14:
66 can be fit into 540 8 times, resulting in a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 13168.68181818
Subtract 528 from 540 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 13168.68181818, with a leftover of 1.2e-08.