865373 ÷ 66 
The aim is to understand the frequency of 66 in 865373.

Let's proceed to step 1:
If we divide 8 by 66, we get 0 and 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.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 66

Let's proceed to step 2:
66 can be fit into 86 1 times, resulting in a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 20 after subtracting 66 from 86.
Take the next digit (5) from the dividend and append it to 20, then repeat: 205 / 66

Moving on to step 3:
If we divide 205 by 66, we get 3 and a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 13.0
The remainder is 7 after subtracting 198 from 205.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 66

On to step 4:
When dividing 73 by 66, we get 1 with a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 131.0
Subtracting 66 from 73 leaves us with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 66

Advancing to step 5:
77 divided by 66 is 1 with a remainder of 11.
Write down 1 as next digit of the result. 
Result so far: 1311.0
Subtract 66 from 77 to get 11.
Bring next digit (3) of the dividend behind the 11 and repeat the process: 113 / 66

On to step 6:
66 can be fit into 113 1 times, resulting in a remainder of 47.
Write down 1 as next digit of the result. 
Result so far: 13111.0
If we take 66 away from 113, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 7:
66 can be fit into 470 7 times, resulting in a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 13111.7
Deduct 462 from 470 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 8:
When dividing 80 by 66, we get 1 with a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 13111.71
Deduct 66 from 80 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 9:
If we divide 140 by 66, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 13111.712
If we subtract 132 from 140, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
66 can be fit into 80 1 times, resulting in a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 13111.7121
Subtract 66 from 80 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 11:
140 divided by 66 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 13111.71212
Subtract 132 from 140 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 12:
66 goes into 80 1 times with a remainder of 14.
The next digit of our result is 1. 
Result so far: 13111.712121
Deduct 66 from 80 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 13:
66 can be fit into 140 2 times, resulting in a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 13111.7121212
If we take 132 away from 140, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
The number 66 fits into 80 1 times, leaving a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 13111.71212121
Deduct 66 from 80 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

After the division, we end up with 13111.71212121 and a remainder of 1.4e-08.